If by "finger gripper" you mean the claw grip, then the best suited mice for your use is easily the Razer Lachesis or G9/G9x (The G9x has a 5700dpi laser rather than 3200dpi)
Claw and fingertip grips are not really the same. When you finger-tip a mouse, the mouse never touches your palm. The wrist edge of your hand rests on the desk surface and never moves. The mouse is held between your thumb and pinky/ring fingers. Those fingers are the only thing moving it around, and thus the mouse must be small enough to get a full range of movement without bumping into your hand.
This doesn't work well on large or long mice, because you can't move the mouse around while keeping the base of your palm in one spot on the desk surface. From the pictures none of the Razor mice look suitable, but they recommend the Salmosa.http://www.razerzone.com/mouseguide/html/fingertipgrip.php
My preferred fingertip mouse is the Microsoft Optical Notebook Mouse 3000. It's great because it's compact and light. I also like the ergonomics of the Logitch M505, but I don't care for wireless. I'm searching for a similarly compact mouse with better DPI precision for gaming. So far the only thing that looks close is the Logitech G9x. The Logitech Anywhere Mouse MX looks like good ergonomics if they had a high dpi version.