I have a Logitech G5 mouse that is perfect in every single way.
And did have a Microsoft Sidewinder X6 keyboard, but sold it on friday as I couldn't cope with the distance of the numpad keys next to the arrow cursor keys, it really was annoying.
So have bought a Logitech G11 keyboard and its brilliant.
I must agree
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Recently got my G500 by Logitech and its superb, its fast, accurate and really does help when i'm doing day-to-day stuffs.
As for the G11, its extremely good, as well as the 18 programmable keys on the left hand side, its well worth its price tag. Had mine about a year and a bit now and no faults, as for the back-light, its only blue but does look nice in the dark
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You should consider the G500 like Stulid has posted above and as well as the G110 keyboard, maybe even look at the G15 or something they look quite smart as well.