I've never heard of tweeters with horns.
Spanky's post has challenged me to make an equivalent to Skrewy's system with less money.
This is a 5.1 system, but it probably won't sound any different from a 7.2:
Front floor speakers (Sony SS-F6000): $200
*I thought these looked like beasts*
Front center speaker (Polk Audio CS20): $170
*Good range center for that surround-ness*
Rear speakers (JBL ES20BK): $203
*JBL knows how to make speakers*
Subwoofer (JBL ES250PBK): $280
*Active sub, it's a beast. Better than 2 subs*
Your choice of either receiver or power amplifier: $???
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Total: $853 + $???
Opinions?