I need some advice regarding GPUs. I picked up a used MacPro4,1 about 6 months ago and it came with the ATI 4870 card. I figured I would be fine until the next round of GPUs from Apple and like many I was expecting something new on Monday. So now I'm not sure what to do. Should I just eat the extra cost and buy the 5870 for $404 (edu discount) for a no-hassle card, or should I try to find a PC card that would work? If I go with a non-Apple card, what is the sweet spot between high performance and minimal hassle? I would prefer to avoid messing with any kexts or firmware hacks, thats the reason I got rid of my Hackintosh and got a real Mac Pro in the first place! Any advice would be greatly appreciated.