I'm running more power (about double) than 5 200's - plus many other components - on a 15A breaker and I've never had it trip yet. The amps are all connected to a switched power bar, which is in turn connected to the non-UPS'd (but spike and surge protected) side of a big UPS unit. All the other components are UPS'd.
I would not play with the fusing / breakers in your basement unless you are a certified electrician. I had one install a 50A "pony" box in that part of my basement that will eventually become the main home theatre - while he was already over doing some other electrical work. It was not that expensive an undertaking, and its there if and when I eventually need it. But based on my experience with the current 15A circuit, 50A is going to be overkill.
Regards.
Jeff Mackwood
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Jeff Mackwood