...why not directly draw on screen? why limit yourself with ancient graphic tablets...
Are touch-screen PCs up to speed wit the graphics tablets yet? Last time I looked, there weren't any options available that had the pressure sensitivity and other features that the tablets had. Maybe that's changing though.
As for tablet recommendations, I've heard good things about this one, but haven't tried it myself yet. Supposedly it's very comparable to Wacom but at a fraction of the price.
I bought a Monoprice around a year ago for about $30 and used it for less than 2 months. It wasn't that hard to get used to, but the pen felt scratchy and seemed to skip a lot. But the worst thing was, it needed a battery, which lasted no more than a week. Even when storing it as instructed. Big waste of money, just glad it wasn't much!