http://www.partsexpress.com
Worth looking into if you want to build you own speakers. They have several books on design, and also lots of components to build your own. Also should be cheaper than buying a name brand pre built.
Personally, I built my own speakers with pioneer components. I omited the center because my front channels are big enough they overpower most center speakers. I originaly built my mains when I was on campus for making music loud as hell. 1 15" sub, 2 4" mids, 2 3/4 domes per box. Plenty of sound and bass even w/o the bass amp on. The rears are 8" sub, 4" mid, and 3/4" dome per box. My sub channel is 8-8" pioneer subs in a row below my screen, and it great for pissing off the wife.
Only have about 500 in the speakers.