I got a Logitech MX518. Too me, any mouse >= $50 is plenty good. I can't use much more precision than what they provide. Hell, I don't come anywhere close to the highest sensitivity settings in any game. What I love about this particular mouse is the buttons in line with the scroll wheel that let you adjust sensitivity on the fly. It's useful when you have a massive screen (1920x1200) that can take forever to move through, but also need to tone down the sensitivity sometimes (e.g. Paint). Plus, it's awesome for games where you need different levels of sensitivity (e.g. sniping vs. spraying in a FPS).
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