I use a 19" on the desktop and the Qosmio laptop has a 17" screen.
I do a fair amount of graphics work for my own websites plus quite a bit of photo editing/painting. Mainly I use Fireworks, occasionally Photoshop and the Corel suite plus a few lesser programmes. I've managed with a mouse for several years but now I just want to 'spoil myself' with a proper bit of kit.
Then think of it like this, sensitivity is the key, not size (you can always zoom in, which is preffered anyway IMO), easily customisable (most are) is always a good point, pens which aren't powered by batteries (can be a pain if you spend hours using a GT and constantly changing batterys'). For graphics work (is this on a professional scale?) GT's are excellent, but they do take some geting used too if you haven't used one before.
I've had a wacom tablet for a couple of years now and have never had a problem with it. It is a Graphire 2 which I beleive may have been superseded, I wouldn't be without it now although I only use it for doctoring photos and in emergencies as a mouse when my usual mouse packs up.
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