I'e actually tried quite a few of these:

Logitech G5 / G9 - Nice mice but I wouldn't recommend them. Logitech's laser mice just aren't as accurate as their mx518. They may be just the thing for high sensitivity gamers or people using LCD displays, but I find that they skip around a bit.

mx518 - Maybe the best gaming mouse I've used to date. Plenty of buttons and nearly all in the right spot. Very accurate, but due to the way it fits my hand I find the logitech wingman style mice to be quicker moving left and more accurate moving to the right. A little odd and hardly noticeable but it works great and makes a lot of use out of a single sensitivity setting. Played it till it feel apart (3+ years).

Deathadder - Dead accurate, dead simple. Very neutral mouse for my hand and a tad more accurate than the mx518. The scroll wheel is great and buttons feel nicer too but I could really go for two more. Best FPS mouse for me. The drivers are nice but are freaken picky and the bottom of the mouse is slightly swollen too - best to use a cloth moue pad with this one.

Coppehead - Suppose to be a left or right hander but I hated this mouse. It just didn't fit right in either hand and not being able to use all the side button bug the crap out of me. Main reason I didn't buy a Razor Lachesis.

Lachesis - could be great I don't know though - I use a mx310 for when I go lefty, the Razor symmetrical mice just don't do it for me.

Steelseries Ikari - The optical looks promising, added to cart. Believe it or not I actually need a mouse, people keep taken mine! - will edit after I get it -

Intellimouse - good feel but never like the no click scroll.

I have a couple of Logitech wireless Laser mouse as well (not G7) but these things are worthless. I'd toss em but they don't even fly straight.

I'd vote 518 but I'll wait for the Ikari, btw there is a good but slightly dated read on ESR.