Are there going to be any problems with this configuration? There shouldn’t be
Will the Geforce 7600GT be compatible with the motherboard? Yeah
Are the CORSAIR XMS2 2GB compatible with the motherboard? Yes
Will 500watts be enough to power the whole pc? More wouldn’t hurt, but it should be enough (you should post the rails, amps, and wattage just in case)
Is it safe to order the processor from tigerdirect? Of course, TigerDirect is your friend - I got a busted case and they sent me a new one (free of charge) and paid for the shipping of the one I sent back - Not to mention they have very nice prices on the Conroe line since they have good relations with Intel (I ordered my E6600 from them)
Just so you know, timings are not a problem. They only become a factor when you want the absolute most out of your system (when you want to make your system the fastest it can be).