Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
Any USB mouse should work perfectly fine on a Mac, although you may not have access to some of the more advanced features depending on the drivers and whether or not there is any software available for OSX.
...I'd just go with the best 2 button + scroll wheel mouse that you can find. Go to Bestbuy, Frys, etc. and see what they got. The Mac mouse is all flash, sparkle and flair.
Any USB mouse will work, but if you want something that is robust and highly optimized, Razer actually has excellent OS X drivers for their mice. The thing I like about them is that they are a surefire way to completely eliminate mouse acceleration.
I just received a Razer DeathAdder Black Edition which I'm now using with my iMac, and I love it. My ideal situation would be a Steelseries Xai with OS X drivers to Razer's, since I still much prefer the shape of that mouse to any of the Razers that I have tried. Unfortunately that doesn't exist yet.
It's funny, the CMO at Steelseries is a friend of mine and I know that he's a huge Mac fanboy. I have to bug him to get his company on that.
Well, I got a response from my friend at Steelseries and it looks like they already have software to eliminate mouse acceleration in OS X, it's just buried at the bottom of their downloads page.