'd pick out the latest and greatest though IMPO(in my personal opinion) I'd get the G610 because almost every inch is back-lit including the logo and I personally would like a roller style for the volume control however the reviews of the switch designed by Logitech has been phenomenal and would be worth the extra 10USD.
Unfortunately at that price point, apart from those two keyboards and a full size layout, other competitor offerings aren't as feature packed as the Logitech(at least not with an RGB option).