Well I did a search on 9800GT/Vista issues and only came up with this: "freezing on startup".  Apparently the pesrson didn't uninstall the drivers for the previous card and there was a conflict.  However, the issue was resolved with Nvidia's 'driver stripper' tool and a clean install of updated drivers.  Apparently, this can be true of any graphics card upgrade and not just the 8800 - 9800... it's always best to clean out the old drivers first.

starkers, pc p&c rates their psu's at the constant ouput not the maximum. I know myh pC P&C 750 tops out between 850 and 900 watts. I'm pretty sure corsiar does now, also. don't judge a unit's value based on the number given for the output. i'm not the least bit familiar with the other brand you mentioned so i can't comment on their value. either way, good luck in your search. i hope you find parts for your rig that last quite some time and you're very happy with them.