Hell, Monoprice has mechanical backlit keyboards.
If you go with a mechanical, do some quick research into the types of cherry MX switches if you don't have the option to use on real quick to get a feel for it. Some types click, audibly click, and some are just smooth action with different resistances.
I've yet to dislike something I've gotten from monoprice too. I personally have a green backlit Mionix mechanical (Black Cherry switches) that I like, the backlight isn't blindingly bright at the highest setting, and it doesn't remember your backlight setting during reboots, but those a the worst things about it.
Actually, the fact that it doesn't work through PS2 is annoying, if you care enough about it being a gaming keyboard for the sake of gaming, use the PS/2 port instead of USB if you can.
Effectively it's the same, but what's that matter right? The difference is the keyboard through PS/2 port interupts the computer to say 'This key has been pressed', and the USB polls the keyboard and asks what keys have been pressed. So, even though if the USB poll rate is 1,000 Hz the difference is going to be less than 1 millisecond, you still are demanding the computer to take notice when using the PS/2 input. Which I like because it shows that computer who's boss. Oh, and using the PS/2 is the only way to get true N-Key rollover ( if you feel like sitting on your keyboard, the computer can tell every key that is pressed, instead of calling it quits after 5 simultanious keys or whatever the keyboard specifies)