Chuck - as far as i know the Graphire comes in one-size -fits all 4x5. you have to pay a lot more $$ for the Wacom Intuos to get the larger sizes.
The big deal with the Wacom is not just the price (their upmarket professional models are expensive) but the battery free technology that they use - any other cheap tablet needs a battery in the pen (or a cord tether) which makes them clunky and heavy.
I'm a big fan of the graphire 2. It comes with a good bundle of toys - when I bought it it included lite versions of Painter (which in this region entitles moving to the full version at upgrade price - saves nearly twice the price of the tablet here in Aus. if you want that software!) and Expression. I'm told that the Intuos tablets are far superior to my little Graphire - but I'm pushed to work out where that would be, as they work so well - and a large tablet would ake up such a lot of desk.