R.A.T 7 is an expensive mouse, so I thought you'd go along with everything good despite the price. As I said, though the tracking sensor of sensei is fantastic, sensei will be too big for you. I tried steelseries kana and the size was good but, in my opinion, one of the worst tracking sensor I've come across. I don't consider genius mice to be good as well. What about Mionix naos 8200? I've never used it, though I heard good things about this particular mouse. But I can really say about what I've tested already, and hands down to DeathAdder. I've got Taipan, it's good too, but even more expensive, so I guess it's out of the budget.