Sub Recommendations

I'm in the market for a new sub; my previous Yamaha YST-SW160 has finally kicked the bucket after 15+ years...

My room is a dedicated theater, 21 long by 15 wide. The subs I have in mind are:

1) Focal Chorus SW800V - $1000
2) Polk DSW Micropro 4000 $1700 retail but can find refurb for $850
3) Polk DSW Micropro 3000 $1450 retail but can find new for $600
4) Sunfire HRS-12 $1000 retail $600 refurb
5) I'd pick something else...

Which sub would you recommend in the 1k price range? And if picking #2, would you spend the extra $850 to buy new instead of manufacture refurb? I've heard the Sunfire's have reliability issues...

Last, I plan on matching this sub with Polk RTi A series shortly.

I appreciate the help

I ended up going with the Sunfire TQ-ES12. It cost me $1300 (B-stock), but it is the most amazing sub I've ever heard. I'm got it turned down pretty low for my room size (24x14), but if I wanted this thing could knock some walls down.

For more info check at my review
www.diymovierooms.com