This isnt actually a car audio question, it is actually a home audio
question, but i figured ill ask anyway.

I currently have a sony subwoofer, this one to be exact:
Sony SA-WM20

As you guys see by the pricetag, this woofer sucks at best. I am thinking about replacing just the woofer inside of it with a better quality one. The speakers I am using are Micro Nucleus sattelites, here's the link:

Micro Satellite Specifications

My question is, which 8" woofer should i replace the cheap sony's one?