I did it! I ordered two PB12-NSDs!!!
Thank you all for your help - every single piece of input was considered and (overly) researched.
Ultimately, I feel comfortable with my choice because:
-My only concern on the SVS PB12 was power, but the facts are a) I'm getting TWO of them, b) I'm upgrading from a freaking 100W Sony, c) as it is, I'm going to run the power for one of them from another outlet to ensure I don't overload my family room's circuit breaker (65" plasma, PS3, Onkyo, DVR, a couple lights, and a subwoofer adds up) - that's probably a sign I don't need much more power!
-While my room is extremely large when you consider what it opens up into, each position in the 7-8 person seating area around the plasma monitor and for music will not be further away than 12 feet from either sub, and in some areas within 12' of BOTH subs.
I think that will do the trick.
-Did I mention I'm getting two $700+ subs to replace one that was under $200? What the hell am I doing?? How did my budget go from $300 to $450 to $590 to $769 to $899 to $1500?
I rarely make purchases like this, but something tells me I'm going to end up very happy!
Thanks again. I'll post here after I've got everything hooked up. Hopefully this weekend but more likely early next week?