The PW -2100 is in a whole 'nuther league of subwoofers than the PDR-10. How big a room are we talking here? In a dorm, apartment, or mid size living room, the PDR-10 or CHT-10 is probably sufficient.
Really, ROBOTEC (cool name btw, brings back memories) you should try to demo a sub in-home to help you determine your needs...do you know anyone with a sub? Will your dealers loan one to you, or allow full money back refund?
Don't worry about a sub that matching with your speakers, it's not the same as timbre matching, etc.
Determine what you need in terms of power, and how much you can spend...then go from there.