I recently bought one of those Athena P300 home audio subs from Best Buy when they had a special promotion going. The sub sounds great, however my main speakers drown it out. I definitely need something with a bigger speaker and more power (probably a 10" would be fine). My main speakers are JBL ND310 series II with a Yamah HTR-5560 receiver. What do you recomend? Also, I don't want to spend a ton of money.