Bet you all haven't seen this before out of a first time poster...ok, thats sarcasm.

I'm mostly looking for reassurance or alternate options. My budget is roughtly $2000 for a listening area of 10x11x8, although the room dimensions are closer to 20x11x8. I am a big fan of 70's music (Pink Floyd, Led Zepplin, etc) so my main concern is good musical quality. DVDs...well, anything beats my TV so I'm happy

I haven't owned my own speaker system and it sure doesn't feel like I've done enough research...so I'd appreciate opinions. However, since I've only been out of college for a bit over a year, I'm very familiar with the loud, booming systems and that is definately not what I desire. I want clear and crisp sound as it was intended to be.

My current plan is to purchase (5.1 setup):

Ascend Acoustics CBM170s front, center, and surrounds
SVS 20-39CS Sub
Yamaha RX-V1400 receiver

So, as the title says, I'm looking for any comments you may have. I am willing to spend a few more $ if there are tangible benefits...I'm not an audiophile (yet).

1 question (if you get this far)....how much of a benefit will a normal person hear off of a 6.1 or 7.1 system vs a 5.1?

Thanks in advance!