I have a G15 V1 that I haven't used in a while. I'm currently on a HP Wireless Elite Desktop, sans the mouse, I like them both. In the retired/backup ring I have a Mitsumi PS/2 keyboard bought early 2000s, that was such a good keyboard. =/
Oh right, reasons. V1 cuz I wanted the programmable keys, and didn't feel arsed enough to "upgrade" (I liked the V1s look compared to V2). The HP keyboard was because it is MUCH quieter than the V1 in terms of its short keystrokes, and it is far more compact to keep around in smaller work areas (I can put it in my laptop bag too). The wireless is an added bonus.
Thinking about buying that logitech illuminated keyboard... but I hate having the elongated delete key since I actually USE the insert key.
Unlike keyboards, I've used the original Logitech Cordless Click! for the better part of 6 years, I won't stop using them until I can't buy them on ebay/amazon/insertfavoriteonlinestore.