Hi, I've been looking at the iMac's on the apple website and have come down to the computer I want. However, with me being 16, with no job, I don't currently have the money to buy it. But, I was wondering if I should get either the NVIDIA GeForce GT 130 or ATI Radeon HD 4850. I plan on getting a job this summer though. I'm not a hardcore gamer as of yet. However if and or when I get this computer, I would like to play Half-Life 2, and Diablo 3 for sure(whatevers out after that I will look into). I read several other threads and people said that the NVIDIA would become outdated in a couple years and it would be safer to get the ATI to future proof my computer. Any suggestions?