This is just me, but the problem is that I don't care much for mice. If they do their job and last, the mice is good in my opinion. Even though I have a bad habit of going through them.
But if you'd like to know, my current mouse of choice is an HP Laser Gaming Mouse. It's essentially an ambidextrous 7 button version of the old Logitech G5. Thumbs are a little mushy, but I don't play FPS games online. It was $30 when I found it, but I don't think they're in the market any more since I couldn't find anything about it. I think my Logitech MX510 would be up there, but the finish on the guy started to peel within a year of use and it got gross holding it. And I actually am starting to get turned off by Logitech mice, aside from their mobile ones, their "high performance" models tend to lose their finish and get gross.
I don't want you to take this the wrong way but for FPS games, especially when played competitively the mouse makes a HUGE difference, and your advice is kind of bad. There are sites that have entire sub-forums devoted to mice (testing, opinions, unboxing, mods). It's a lot more than just get any mouse.
As for what mouse to get there are a few top contenders right now: the new Deathadder, the Logitech g400 (many people believe this to be the best I have one), Zowie AM/AM-GS (an interesting choice, it has stiffer buttons so some people don't like it, but it also has the lowest lift off distance). And all of these are still optical/infrared because the current laser technology in mice is terrible and you shouldn't get them for FPS games.