i have microsoft sidewinder x4 keyboard.
can't complain, has 6 macro keys that can be programed to do anything you want and its rather cheap.
Finally replaced my G15 (oldschool blue one) after god knows how long, it finally started to crap out (backlight started flickering, driving me berko)
Got myself a Razer BlackWidow Ultimate, was loving everything about it except the spacebar (and the fact it gets covered in fingerprints cuz of the glossy black plastic).
Turns out the reason spacebar was pissing me off was it was catching on the right alt key, apparently its a known issue with a few (spacebar mold was too big) and have had it RMA'd. Waiting on a replacement now hopefully with a better spacebar. Don't let that put you off tho, its a pretty rare occurrence and everything else about the keyboard is amazing, especially the way it feels compared to my old G15 (which I loved).
I was also looking at the Roccat one but a quick google search for reviews will quickly put you off it, keys wearing off etc. (dissappointing cuz I bought some of their headphones and they are amazing)