I have used plenty of keyboards in my time inc. gaming onces. Saiteks(I, II, III, Cyborg) Logitechs(Most of them inc G's) etc.
But for my vote as the best gaming keyboard sofar must be my Emprex 9051H Cheetah Professional Gaming Keyboard.
Got it from Amazon.uk about 6 months ago, havent looked back since. Superb with almost any game esp. fps (used to often get cramp in my left hand due to my hand and fingers trying positioned them to access the keys and not accidently press the wrong onces, ie, WASD, Shift Ctrl etc, but no more with the Cheeetah, it has an excellent layout for those grouped keys, works for both lefthanders and right). However, as a normal keyboard, ie for a lot of typing work it is not great, mainly due to the wierd layout, only suits games. But easily imo the best out there.
It has my vote. GL with whatever you go for though.
Cheers