What to expect? If you've got headphones and no friends, pure bliss. That's why I like blues. (I say no friends because they're loud) keystrokes just feel smoother than the other switches, and the click and tactile bump is quite satisfying. I had a qfr with blues for the longest time that I used for gaming though, and I always found myself miskeying. If you plan on primarily gaming, and you're a bit heavier handed, I'd go with greens. If it's for typing though, blues are awesome imo.
I should mention also, I got a blackwidow recently, and while the click isn't consistent from switch to switch, and I don't like the angle the housing puts the keyboard at, it feels like a nice middle groundg between blues and greens. Not too heavy, but not too light, and with a bit deeper tone in terms of the typing sound, which I know is important to some people. I'm planning on recycling them soon and using them in a custom tenkeyless if I find the time.
If noise is an issue and you're are heavy handed, I would try whites, either with or without the o rings. Its still a tactile click, but it's a softer click, and though they're rated at 100cn by that one wiki out there on the interwebs, they feel closer to greens at 80cn in regards to actuation force. Just comes down to experimenting really.