18-150Hz vs. 28-120Hz?

[Tony5272]

I'm interested in buying one of these two subs. Only because of the convenience of picking either on of them up at BestBuy. Plus I have BestBuy gift cards so I don't have to lay out to much cash. If I was to get something else I don't want to pay over $400 that includes everything. I'm open though to better choices.
Either the Klipsch SW-450 10in Subwoofer FR: 28-120Hz 200watts RMS $449 or Definitive Technology ProSub 1000 10in Subwoofer FR: 18-150hHz 300watts RMS $499
Now my question is, can I hear a difference in frequencies levels? Does it matter that the Klipsch only goes down to 28Hz? Are either of these subs worth the purchase? My setup:
It's a finished basement with a large area rug. I put a long curtain to divide the room because it is a big area. So the room dimensions are 12x17. Thats the area I will be watching my movies in. I'm going to use the sub mainly for movies & videogames, some music. I want to feel the bass hit me but I don't need it to bring the house down. Also the only place I really could put the subwoofer is right next to or behind the left front speaker tower against the wall. Want to make a purchase in less then a month.

I also looked at the HSU STF-2 for $349 l Outlaw LFM-1 Compact $399 l ED A2-300 $350 not sure what to do. Any of these other that much better then the Klipsch or Definitive Tech. I really don't feel like waiting for ever for the A2-300 to be shipped.