good list i'll add some of my choices

www.sundownaudio.com <---- I run the 100.4 and the 1500D

www.cdtaudio.com <--------- I run the HD-62

www.usamps.com

www.eclipse-web.com (TC sounds used to be their buildhouse for thier alum and ti subs ... dunno if thats still true)

www.arcaudio.com

www.dynaaudio.com

www.mach5audio.com <------- the best woofers if your on a budget IMO

those crystals are just plain awesome for the price but i am very biased since i've installed my cdt's