I'm thinkin the Infinties and the E12KD's would have the best SQ. The Audiobahn's will have great SPL, but will leaving you wanting more in the SQ area. I think the SE is pry an all-around great sub. Nice SQ, with great SPL. And i dont know much about Soundstream. I myself am i RE man, so i would go with the SE, but my listening styles pry differ from yours.
'84 Chevy K5 Creative Conversions Blazer (super rare!), restored, new paint, new 355, dual exhaust, interior in progress
4-Boston RX7 5.25's
2-Boston RX7 6.5's
2-Shocker Super Extreme 12's in 11 ft^2 @ 32hz
Soon to come:
US 2000X or Tsunami 1800
7 inch screen
PS2, DVD player, VHS player
Hope to be done around the 1st of the year!!!!