When I was a child I was very picky with what shoes I could wear. They needed to be PERFECT. Nowadays it is much easier to buy shoes for myself, but I'm super picky when it comes to my mouse instead.
I was a Logitech MX500 user until it fell apart. Then I was a Logitech MX518 user until that one fell apart aswell. Now I'm a Steelseries Diablo user and I am super content with my purchase. Since I bought it (December 25th 2011) I have right clicked a little short of two million times and it still feels like new. Most mice start to feel worn out after you've clicked a few million times, but this one is still feeling great.
However, the reason I got it is because of it's ergonomics. If you like the Logitech MX ergonomics you've gonna love the Diablo. It looks sick too, with the spine scroll wheel, tribal patterns, magma pulsing glow and matte rubbery finish. I get sweaty hands sometimes when I game during the summer, but so far I have had no problems with the finish of this mouse.
I can't recommend it enough. If price is not an issue: get this mouse.