Mike,
The Auras are junk. Plain and simple. The Clarks are way overkill. Your best buy is the RBH FX-80; They are about $80.00 ea. and much more precise in Frequency reproduction and more reliable as far as power handling. Get more info at:
[Link: rbhsound.com] You'll need another Amp (100 wpc minimum)and a "Y" Cord to split the pre amped Sub Woofer signal
Want some advice tempered with 23 experience? I'll be glad to steer you straight.