hm alright here is my two cents
if you want a g502, go ahead, it's not that bad of a decent mouse. but my point is that you should try to get something you wouldn't have any hesistations of buying (g400s is tested and is good).
the microsoft intelli explorer 1.1 and 3.0 has flawless sensors with one downfall, very low perfect control speeds, even if you oc. but if you don't use quick swipes, it's good. scroll wheel wise, they have a mouse with a flawless snesor, often called the cousin of these two mice, the wheel mouse optical. the scroll wheel is good, albeit not what you're probably looking for.
so...
g502, g400s, microsoft, anything. buy something you'll love.