Graphic Tablet Recommendations?

[Tom C]

I'm considering purchasing a graphics tablet for use with Photoshop.  I've 
been looking at the WACOM Graphire 3 & 4 (6 x 8).

Does anyone have any anecdotal experience they can relay?  What's the 
difference between the '3' model and the '4' model?  It looks like the '4' 
is twice the price, but LPI, accuracy and sensitivity appear to be identical 
to the '3' (at least on the B&H website).

Any other manufacturers I might want to consider?

Thanks.

Tom C.