I'm using a Corsair M60 and am loving it! Moved on from a CoolerMaster Sentinel Advanced when the left button started dragging. I was looking for something between a claw grip and a palm grip and this one fit the glove (no pun intended!:))
You should choose a mouse based on your grip type. The M60 is a good balance between both grips and the button placements on the side are just fine. Plus, I like the sniper button (which admittedly takes some practice getting used to). The handling is also pretty good as the mouse is able to travel quite smoothly thanks to the teflon feet (which is pretty common nowadays in most mice).
I'd recommend the M60 over a Razer, which is strictly my opinion!