I'm using a Logitech G110 keyboard. 12 additional, fully configurable keys with 3 modes each (mode switch dial is above them, along with a quick macro recording button), which can be set on a per-game basis, a switch to physically disable windows key (useful if the game uses alt and ctrl extensively), mute buttons for headphones/speakers, volume control, music player control buttons, an additional USB port, built-in sound card (not the best one out there though) complete with ports to plug your mic/speakers to it (and separate mute buttons for each), sleep/wake button and customizable backlight. I forgot how much my father payed for it though (I've got it after he found the hardness of keys didn't suit him, for me, it's fine). I find it's layout comfortable, more than any others I used (especially my previous, cheap one, which had a computer shutdown button right above printscreen button).