Finally get to buy a real sub...

[vsidhu]

I finally have some free cash and have decided to throw it at my home theater. I am putting most of the funds toward a sub (maybe 2). I will be buying my speakers used or later on when I get more cash.

So far I have looked at:
Klipsch rw-10d
klipsch sub-12
kef c4
polk psw125

So my price range is around 400-500 per sub. Any other recommendations are welcome. I just want a sub(s) that can handle a movie like Iron Man (esp. the end of the cave scene) without distortion, port noise, etc.