I've successfully used the Intuos2 6"x8" model for a while now ( http://www.wacom.com/intuos/ but it seems that they're at Intuos3 these days). You get position, pressure, tilt, point, eraser, and two side buttons on the default pen. Looks like Wacom has a fancy 6D pen ( http://www.wacom.com/art_pen/index.cfm ) that does rotation as well for the newer Intuos3 line of tablets.
The tablet runs around $330. I prefer the 6x8 because it will fit on one arm while I draw with the other. I don't run strokes that go off the edge of the tablet drawing area and I don't use it for tracing so I'm not sure that a bigger one would help me anyhow.
Ooooo... They have a wireless Graphire tablet available... I shouldn't look at new hardware. It's not good for me or my budget. Fortunately it doesn't have tilt so I'm safe!