Logitech G15. I use it, my friend uses it, and we both love it. It's got soft tapping keys, orange backlighting, and a small (very useful) LCD/media centre on the top. It has 6 Macro keys, and 3 modes. So 18 Macro keys in all. Also a very useful key... it has a 'Windows key cancel' switch. So in game, you don't accidentally minimize your game! XD
That is a nice keyboard, but one of the requirements was that the keyboard be < $50. The G15 is $90.