Bridgman,
I have also read several reviews as to how "musical" the PSB subs are. My local hi-end dealer even told me about how those (along with Athena's) are his favorite budget subs. My dad has the 5i and is does seem exceptionally tight. Hopefully in a few months I can do a shootout between his 10 inch 5i and my 10 inch STF-2. That same dealer admitted that the Hsu would go deeper and he deeply respects Dr. Hsu (as he has met him several times at CES). My vote would go for Dual STF-2's. Ultra clean, tight, and deep bass.
