lol
mine is old now -It's a 6x8 Wacom Graphire
I'd definately recommend the 6x8 model or larger as long as you can fit it on your desk.
Because DIP cant use all the bells and whistles you may as well get a more basic model. I went and did a little reading and prob this one
http://www.wacom.com/graphire/6x8.cfm would be ideal - unless you particularly want the bluetooth ability
HTH