Subwoofer advice needed!

[Ito]

Ok, so I recently upgraded my receiver to a Harman Kardon AVR 235 and the only subs I have are passive subs, so I'm looking at buy a new cheap subwoofer.
I am a college student and this will be going in to my dorm, so I don't need anything that will blow people away, just something that sounds good...although blowing people away is a fun plus for college

I'm looking to spend less that $160 on a sub, but I wanna get the best one out of the rice range (although I would prefer to play less). I've done a bit of research already and here's what I came up with.

Infinity HTS-10 (BU-80) – $110 (Craigslist)
8”, 75 watts, 45 - 150 Hz.
3-4 years of use, but still in good condition
Comes with front, center and rear speakers as well.

Sony SA-W2500 - $84.95 (B&H)
10”, 100 watts, 28-200 Hz

Onkyo SKW-204 - $99.00 (B&H)
10”, 230 watts, 50-200Hz

Sony SA-W3000 - $134.95 (B&H)
12”, 200 watts, 20-200Hz

Velodyne VX-10 - $144.95 (B&H)
10”, 150 watts, 36-120 Hz

Velodyne VRP-1000 - $94.96 (circuit city)
10”, 170 watts, 35-140 Hz

If anyone has any advice for me, please tell me, as I need some help. Thanks you so much!

The infinity sub is kind of deal cause it come with some nice front, center, and rear speakers as well, although I am not in the market for them, they would probably be an upgrade from what I currently have (some sony bookshelves and some LG's from a home theater in a box). The have a lot of use in them though which makes me skeptical cause I'm worried about the sub blowing, and I won't have the extra money to replace it