Help picking sub

[LOA5000]

I am looking for a sub woofer to go along with the 80 sharp led tv. Its a pritty big room with 3 couchs and a chair. Hard Floor no rug. I cant decide from these 3 sub woofers. 15" Home Theater Sub Powered Surround Sound Down Firing Subwoofer 600W SUB15D | eBay 15" Home Theater Sub Powered Surround Sound Subwoofer 600W New SUB15F | eBay http://www.amazon.com/Polk-Audio-12-Inch-Powered-Subwoofer/dp/B000092TT0/ref=pd_cp_e_1

 

[americanaudiophile]

If your budget is limited and these are your only options then go for the Polk. Subwoofer power specs are notoriously exaggerated so don't use that as any kind of guide. Woofer size can also be deceptive since a better 12" will sound better and play louder than a cheap 15"