See, I have a hang up that since i have a 64 bit processor, I need a 64 bit OS. Help me stop!!
Look at it this way... your machine is ready for the future. When 64 bit OS's, drivers and applications catch up to your hardware you will be ready for them. Both apple and MS are in the same boat here... neither one has a viable 64Bit OS yet. But they both will within the next year or so. And the previously mentioned point about XP (or Vista) not recognizing more than 3GB of RAM is correct. But again, once 64 bit OS's catch up you'll be ready.