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I am going to buy a wacom intuos tablet to make life easier when using the pen tool etc. From what I have read, the intuos 4 is much better than the old intuos 3, however, the 3 is now half the price of the 4 in the used market. For those of you that have used both, do you think I would regret not spending the extra on a 4. I havn't used a pen before, so it will all be new to me, and I will pay extra for a 4 if I thought I would regret not getting one later.
Here in England, a medium intuos 4 is about £300, and the average used price for a 3 is about £150.
many thanks.

I can't say about 3 vs 4, but I never took to the tablet. I bought a 3 and did a few illustrations with it, but decided I liked the mouse better. I guess you don't know until you try it though.

I got a 4 recently, the stores around here still have 3's on their websites but they don't actually have any and can no longer get them.  (I AM in a small market though).

There is a new major vendor in town, I called to see what they had and he had one in stock.  He makes sure I know they price match.

So... I went to Wacom's site, looked up their authorized sellers, all the stores in town have it for between $449 and $549 (Canadian).  But... I see that Costco online sells them.  I never would have thought that they Costco would carry a tablet.  Anyhow, their price was $399 vs $449 at Henry's.  I printed it off and took it in.  He matched the price (although he let me know that they don't normally match Costco.

So the moral of my story is, look up the retailers in your country and make sure you get the best price, most electonics stores here price match.

Thanks for the comments. I have decided to go for the intuos 4. I know I will keep wondering if I get a 3
As for the last question, I have read many people are happy with the medium size with most screen setups, but I guess it depends on what your main use will be. I just need it for photo manipulation but if you are doing illustrations I guess the bigger size would be better. Maybe someone better qualified may make a comment.
Thanks everyone.

And how do you manage a dual screen with the tablet?
I actually own a bamboo and it is too small to handle both screens. Vertical is ok but horizontal is too long for such small tablet and the handling is horrible.
I have limited the tablet area for the main screen and If I have something in the second screen I have to go with the mouse.

Its time to upgrade the tablet.

Just to add that I received my Intuos 4 medium this morning, and I love it!!