Dear KOC,
These are the main ones I'm using these days:
Q-Roll Putter Classic IV flattop grip
Quantum Putter round grip
American Putter midsize Golf Pride flattop grip
Arnold Palmer leather spiral wound grip
I am also always trying out / testing new putters and old putters too.
Cheers!
Geoff Mangum
Putting Coach and Theorist
Geoff Mangum's
http://puttingzone.com
http://www.puttingzoneclinics.com
http://www.network54.com/Forum/52812
http://youtube.com/user/geoffmangum
http://picasaweb.google.com/puttingzone
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