What is a good 8in sub to replace my home theater system?

[mario]

Under 55 dollars and over 180 rms
The driver is not shot it's just the sub I have can't handle the power so I'm looking for something that can handle it. The theater system:dav-dz170, I talked to Sony but they really didn't help so I decided to change the sub but don't know what sub to get.

 

[danceswithcats]

Hey Mario, we need more details. Is the driver (speaker) in your subwoofer shot? Please explain.