Thoughts on having 2 different sized subs in same room

We are currently in the process of redoing our living room and "Managment", or should I say my, wife does not want any funiture in the design that will provide a place for my equipment. Luckily I still have my main system in my man cave / media room and now since I have an extra sub was considering incorporating into my main system.

Main system breakdown:

Bob Carver Crimson 275 Tube Amp

(80w x2 @ 8 ohms)

Parasound ZPre3 Pre-Amp

U-Turn Orbit TT w/ Ortofon Super OM20 

Ifi Zen Phono Pre Amp

Warfedale EVO 4.3 Speakers

SVS SB12-NSD subwoofer 

Potential Sub to add:

Audio Source SW15" 200 w Sub

Any thoughts?