I use the G110 and have liked it quite a bit. How much are you willing to spend on a keyboard? If you can afford it, I suggest stepping it up and getting one of the higher end G-series keyboard. Also, if you can afford it as well, I suggest getting a Logitech G-series mouse to get some more extra buttons. :P

EDIT: Darn it, forgot to include the reasoning. I find the Logitech G110, as long as I use the wrist-rest that came with it, to be incredibly comfortable to use. The headphone/microphone jack on the front of it is also useful for me (since my computer has no front-headphone port. >.<), along with the USB port. It's great for wire management. Thing is also tough. The backlighting is also very nice. And it's great to type with, in my opinion.