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Is it only Canon and Nikon lens that rule? If you believe that, I am sure many Sigma users will laugh at you; many who use Canon and Nikon bodies.

Not quite really. While Nikon and Canon do the most advertising and most salesman , me included get spiffs for selling these two names, no optically informed technician in his right mind is going to dare say that only Canon and Nikon make the best optics.
Pentax , Olympus (Zuiko) , Lumix (Zeiss, Leica),  lenses have been making equally good optics.
There is also the Summicron made by Leica that is far superiror to any of the Canon and Nikon glasses. Yet how many ads do you see , or how many Nikon and Canon proponents even know that lense exist?

only you don't see as much marketing in magazines. Also, writers also get paid to write good things about the products that advertise the most with their magazines. This any marketing consutlant will politely reveal.
It only appears that Canon and Nikon make the best glasses, but that is a marketing perception.
Is a Porsche not as good as a Mercedez or a Volvo? HAs anyone heard of Aston Martin?   
 You would be laughed out of the debate if you think that one brand makes the universe. Same thing that happened a long time ago when some American dude  thinks that his TransAm is better than his friend's Camaro, and never knew that the CooperS and LotusElan existed, simply because he didn't see the ads on either of these much better British cars.
Or touching much closer, in the old days, how often did you see an ad of  Sinar ? or  Rolleiflex  or Leica? You still only saw Nikon and Canon.  But we all knew we didn't have to rely on ads to tell us about Symmar lenses, or Leica , even though all we read about and carried were our Nikon Fs. We still also used the Leica as much.

 It's all a perception, you paid a lot of money for it, you'd better believe it's the best. That's why it cost more, you paid for the ads. As for Summicron, you pay for the glass alone, and not forthe ads or  the spiff Nikon and Canon pay the camera sales people.

@puravida actually what you say is true, but I did not say anything about that pentax's or sony's lenses were worse than nikon or canon's. In bold, I said that canon and nikon have more lenses to choose from. I said nothing more. I also agree perseus in saying " a bad sculptor who blames his tools."

hi Puravida,
sorry
my cam is Sony Cybershot DSC 650 S.
I'm having already two lenses from my Canon film camera EOS REBEL X S
one is Canon Zoom Lens EF 28-80 mm 1:3.5 - 5.6 II
second is Sigma Zoom 100-300 mm 1:4.5 - 6.7 DL
and I would go for a Canon to buy, given I'm already having lenses, just don't know what to start with.
Any advice will be appreciated.

Thanks

Also, Booggie, re: what puravida said,  here's some additional hints from me as someone who sells pro equip as seasonal :
-don't try this at the mall or large departmental stores. the security will come down hard on you. go to the pro stores , they are used to having pros do this.
- even if the pro stores are more expensive, just do the test.
- check around for the prices, get quotes, and then go back to the pro store to let the salesperson know you had a better price. we always price match.

I like to buy from one person or one store. It builds confidence and many times, we exchange ideas and even get to hear of horror stories about equipment, even some of the top names have lemons.
We all work on commissions, so it is in our mutual interest to be good to our regulars. As a photographer, I do this even when I travel, I have certain stores I favor, and most times, I end up with the cheapest price because I get them to price match my best offer.

In return, I use that extra savings to buy extra stuff from the salesperson ie. mem card, card reader, filters,etc.  or simply put that savings into my next purchase, from the same store and the same sales person.

P.S.
and don't neglect the savings you get from trade in to upgrade.
My fave pro store (which just opened here in my lovely city) is always advertising on trade ins values and even if you can't find the used equipment in this branch, they can get it from another across the country.

Instead of getting yet another Canon, why not get the Lumix GH1
the first DSLR camera that will video better than any other DSLR . 1080p 24fps , 720p 60fps, in HDTV Stereo , with continuous focusing. Lumix uses Leica lenses so it blows away the competition in that optical grounds too.  The other DSLR that can do videos even the top names cannot do even close to this bugger.

I do not subscribe to the problem of not so many lenses to select. Any professional will tell you he/she  only uses a selection not buy all 60 or 200 different lenses . So the argument that XXX camera has less lenses than Nikon and Canon or Pentax or Sony, is moot.

Why I suggested this, is that you already have all you need for still stock photos. With Lumix GH1 you have the edge over any one else to do video for stock.
Just an out of the box idea .

touche ! 

Well, look on the bright side, basti. You can travel all over the world with your Olympus, and won't get robbed. Nobody wants a "lousy cheap" Olympus. 

Seriously, Olympus has been making some of the best and lowest priced cameras and lenses.
Even the dedicated flashes are underpriced compared to the Big 2, or even Pentax.
We all pay for the advertising, or the symbol. Zuiko has been producing optics for scientific instruments long time. I guess it's not good enough for photography

FWIW, somehow Canon cameras have the most trade-ins, even with cameras that are hardly used. The owners tend to keep looking for next year's model, much like xbox or ps,etc.. enthusiasts look for the next game.
The  users of  other makes tend to hang on to their camera longer regardless of next year's model. not sure if there is a significance or not.

OK.....so you've decided on your camera and lens kit, but that's not all of it. You also  need to consider your computer and software, and internet access, all of which need to be built into the initial setup costs.
Good luck, its worth it for the fun.
BUZ