Thoughts on Polk Micropro 1000 (or other subs $500 or less)

[drummerboy_2002]

I'm upgrading my setup, going from a 5.1 $300 set of Sony's to about a $2000 7.1 rig. Haven't finallized, but forerunners are Definitive Technology ProMonitor 1000's and Klipsch RSX-5's. Yes, they are satelites. Can't do anything about that. Obviously I'm going to need a quality sub to round out the audio spectrum. One that has jumped out at me is Polk's Micropro 1000 (8", 1200W RMS). Room is L-shaped at about 16'x16' for the main part of the room with an 8'x10' Entry, with 12' ceilings. I need a sub that will deliver clean, tight bass at low to moderately high volumes. Don't usually crank the volume too much, I've lost enough hearing as it is. Plan on using it about 75% movies, 25% music, but needs to sound equally good. I need some feedback on the Polk, or if you have any alternative that fit my needs and price range, let me hear'em.