Clicky keyboards offer a more (BS) or less (Cherry) "dead zone" between de-activation and ability to press the key again which makes them less suitable for repeat button mashing IMO.
I'm not an avid gamer, and playing with BS boards is fine, but I don't quite see the point in buying a clicky board for gaming (it depends on the game, though--so we should have to ask what games you're playing); you won't type on it, but rather press and hold keys or repeatedly actuate keys as fast as possible.
Blacks are good for that, because they'll "bounce back." Blues, however, tend to "stick," which is not of much concern for typing, but which can be really irritating when rapidly pressing the key.
So, for example, in RTS that more resemble typing than anything else, tactile or clicky switches should be nice because you'll be able to feel when you've actuated them. You do lose some speed, however, so if it's just 10 minutes of rapid button mashing, you could as well go for linear ones.
For FPS, it doesn't matter if a single keystroke was registered correctly, as you'll most likely hold down the button or repeatedly press it anyway. Blacks are fine there, too.
Blues are the better "allround" boards, but seeing he does have a Unicomp board already, I just don't see the point in getting anything that's nice to type and okay to game with. The Steelseries isn't cheap, but it does have NKRO, which the Das doesn't. Also, I think blacks (or reds even moreso) are more suitable for gaming than blues.
-huha
