actually i dont judge mouse by its sensor in particular i judge it by size and how it will fit in my hands plus the feel is way important to me. if u have big hands and prefer claw grip u wont get a better deal then corsair m60 coz it shines in price vs performance.
about sensi its a great mouse but i dont get its high price though. but again choose one that fits ur grip style if palm then go for sensi.