A tablet makes a big difference in how well you can do fine work.
I find a 6 X 8 tablet ideal for most single screen work. I got a 9 X 12 Intuos because I use dual screens and it is easier to reach across. But the tablet is bulky.
The little 4 X 5 (actually 3.75 X 5) tablets don’t work well for me. If you have enough movement for fine detail you are always running into the edges. If you map 1:1, the ratio is too large for pen movement to cursor movement and fine detail isn’t that much easier than just using the mouse. That is especially true if you go to mouse properties and increase the ratio of mouse movement to cursor movement when working with graphics.
If price is an issue I would go with a cheaper brand in 6 X 8 rather than get a smaller Wacom. Several people posted that they have been happy with the Aiptek Hyperpen.
http://www.compuplus.com/i-Aiptek-Hy...r-froogle.html
Artists tend to like larger tablets for bold strokes. I have little artistic talent and am more technical in my image editing. If you might do artwork with the tablet you might consider a 9 X 12.
The pressure sensitivity is good also for drawing. I don’t tend to use it much in image editing. I just cut my flow. I’ll use it sometimes if I want to write on something or quickly draw an arrow – it looks a lot better with varied strokes.
The Wacom Intuos line is the gold standard. Definitely go for one if price isn’t a limiting factor. I used a Calcomp 6 X 8 tablet for years before I got an Intuos and was quite happy with it. I honestly couldn’t see much difference and I think the Aiptek tablets are equivalent to the old Calcomps.