Okay okay okay.
Before anyone starts spraffing stuff about "GAMING KEYBOARDS WITH LEDS, YEAH!" you need to realise that they're not any higher build quality than your generic USB rubber dome keyboards, and that they're going to feel exactly the same when you're typing. In short, you're paying for the LEDs and keys you're not likely to use terribly often. Where it becomes worth paying more for a keyboard is when you start paying for mechanical key switches. If you've ever heard someone typing on an old, clicky keyboard, this is what you're hearing. These offer far better tactile response than any rubber dome keyboard can ever hope to achieve, and will last for a very, very long time (I think each key is rated for like a million strokes or ten million strokes or something, and most work well after then - search for the IBM Model M).
To summarise: it's worth buying a mechanical keyboard (such as the Razer Black Widow, which is a mechanical keyboard aimed towards gamers), but it's not worth buying a "gaming" keyboard.
If you're looking for more information, I highly recommend looking at the mechanical keyboard thread on www.overclock.net. There are plenty of well-informed individuals there who would be happy to help you find the best keyboard for you.
Edit: there's way more, too; most of them can support a higher number of simultaneous key presses than their rubber dome rivals, which may not sound important, but it can be.