Will my upgrade be ok?

Depends on the chipset/CPU used. DDR3 can be dual or triple channel. Only thing using tri-channel right now is the i7.
 
Will the 650W Coolermaster PSU be ok for this system with regards to possible 2x crossfire setup?

I wouldn't get that one. Assuming it's the Extreme Power. They aren't all that efficient. Try get something 80 Plus/SLI certified.
 
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