Amp Advice for newbie

room is 20x20. how would I tell if my electrical system can deliver that much power? I'm currently running 200x5 B&K

Thanks Dist - Let me line it out this way:
Room - 20x20 with carpet, overstuffed couches and large paintings on all walls. Room also opens into staircase running length of wall to upstairs, landing area into dining room and hall into kitchen. So I have some space to fill and some absorption.

Listening - Concert DVD's 40% of time, DVD-Audio or SACD in 5 channel 30% of time, movies in 5 channel 20%, and straight out 2 channel 10% of the time.

I like to play it loud and listen more for clean delivery than details and nuance. I'm pretty much narrowed down to Bryston, but have a great lead on a Sunfire Signature at 400Wx7 which fits my current budget constraints better. Any other thoughts would help. Thanks.

I feel pretty confident with a deal I got on a bryston 6B SST for the front 3, and I'll use the B&K for the surrounds until I can put on a Bryston 4B SST. Still taking opinions though. Thanks.

so cost aside...bryston or sunfire?

Good counsel, will set up in-home listening. Thanks.