I was looking at US Acoustic amps as a next purchase for my interior speakers (4065), and maybe for the subs (2100). I have a perfectly good Cadence Ulra-Drive Z100 that I know will satisfy my low end, but it's a bit big. (I changed it out for a smaller Autotek SS-300.2 but it didn't deliver as well in transition or at the higher sub frequencies). So far, I only heard good about the US Acoustics, but I haven't heard a lot about them. Any opinions?

For subs, I figured that I would try the Pioneer IMPP TSW1241C. I've been quite happy (suprisingly) with my old Audiobahn subs, but I wanna try something different. The Audibahns, dropped hard in my Z28, and had good transition. I'm currently using a single one in the WRX. I've been reading good thing about the Pioneers. Now that they are a lot cheaper, I figured that I'dd give them a shot. Any opinions on these subs, or suggestions of better subs at the same price?