I'd like to use a helper woofer with my Tang Band 1808 in a low, wide open baffle design. I've been looking at these two, partly because of the price and the high Qts: the GRS 12FP-8, and the Eminence Alpha 12A. I plan to crossover to the Tang Band at around 200 Hz using an active crossover. One downside to the GRS is the lower sensitivity - since I'll be using an active crossover its not as big an issue, but I'd like the option of later building a passive crossover to allow use of just one amp if desired, and the GRS would probably disappear in that event. I've about settled on the Alpha. Any other reasonably priced contenders I should consider, and do you agree that I should go with the Alpha?