optical trackball is the way to go, both my machines have em, they take a little adapting too, but once your hooked using a mouse feels cumbersome and innacurate for everything from desktop to fps games, I would never go back, plus when you spend the amount of time I do on the PC, you don`t get any shoulder/wrist pains with a trackball, like you do with a mouse (and it has a scrollwheel too)
Mentor.
ps: I take it Mr X uses the scratchpad on his laptop rather than a mouse, I can`t live with those things, they annoy the behind off me, always selecting stuff you didn`t intend and fiddley as hell
PC1: P4 hyperthreading 3ghz, 1gig mem, 2x160gig hd`s, ATI radeon 9800 pro gfx, 6 way surround sound, PC2: AMD 1.2ghz, 512mb ram, FX5200 ultra gfx, stereo 16 bit soundblaster, ups.