Well, this might be worth asking here, so here it comes:

By your experience, is a 850W psu good enough to hold a i7 system with 2, maybe 3 gpu's?

I want it to be flexible enough to allow me to ad more cards in the future.

Currently, I plan on having something like 5870/5850 as main card, and assign a 9800GTX as a phisyx card. and maybe have room fro a crossfire in the future.

Any toughts and sugestions about a good fit PSU Wattage with enough amps and Brand?