Looking to upgrade my old 90's Yamaha SW305's (have two) with newer technology. I want a higher performance compact design (8 inch) and keep the cost under $500 each because I plan to stay with twin subs and spending around $800-900 for the two. Been reading some reviews and have narrowed it down to a few. Looking at the HSU STF-1, Outlaw M8 or the Def Tech supercube II 8 inch. Heard good things about all of them. I will mainly be using them for 2-channel audio with occasional HT use in a 20'x20' room with 10' ceiling. Any suggestions or better subs out there to meet my criteria? Thanks!