NEED HELP

My funds are limited to $450.00. I have narrowed my search for a subwoofer down to a HSU STF 10" or a Paradigm PDR 12". I will be listening to SACD music 90% of the time. I have been told that the front by two saleman that the front throw would be better for music while the downward throw would be better for movies. My room is 15' x 22'. I have two Polk LS 70's for mains and two Kiplsch RN35's for rear. There are two archway's that lead into the kitchen from the living room. Could someone give me some advice? It would truly be appreciated. I realize most of you on this forum have truly high end equipment, but retired school teachers just don't have the funds most of you have. Thank you for any response. - greg gle56@cox.net