I like my RAT 7, but its sensor has had too many issues for me to keep using it and it's out of warranty. My personal recommendation would be the G500 but that is on the larger side. Personal preference definitely weighs into mice suggestions.
I'd also like to recommend not getting a RAT 7. I've had sensor issues as well. The housing for the laser seems to like to collect dust and a spray with some condensed air usually does it, but sometimes it'll happen when you least expect it and can completely ruin a whole round in a multiplayer game if it happens at the wrong time. Also, I use the side buttons a lot, and the side buttons stopped registering unless I hit it from an uncomfortable angle. Fortunately it was under warranty and they replaced it but I suspect the issue will come again over heavy use.
I had a Razer BlackAdder which I loved except for the slick sides so if your hands are wet at all, you'll have trouble gripping it. It looks like their new edition of the BlackAdder, I think they call it just the BlackAdder 2013 Edition or something like that, has grips on the sides. I think if this RAT 7 has issues with the side buttons again, I'll be buying that Razer.
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