Ive been playing with a Razer Lycosa for the past few years but just picked up a G510 to go with my new rig Im putting together after work tonight. The Lycosa was a pretty standard board, but just from looking at (and fondling) the G510 I think it's going to be a definite upgrade.
I went with the G510 over the G19 because I actually didn't want the full color LCD. I have the same LCD the G19 uses built into my SpacePilot Pro 3D mouse and honestly it's distracting for me. The G510 display gives me the info I want (who's speaking on comms, computer temps, etc) without the fluff.