Re: track ball or mouse?
What I have found with trackballs is they gather typical Ick (various stuff on your fingers hairs and such) But the last time I used a track ball was quite a while ago so they could have improved on this. Also its really boils down to preference, some people like to have something they can move other like the stationary track ball. So before buying one if you can try one and use it in typical everyday circumstances and then go with what you like.
i7-930 currently no OC, 6 gigs Corsair, Gigabyte GA-X58A-UD3R Motherboard, Asus 5770 HD gpu. Running like a dream.