How hardware intensive is iOS 4.3 development? IOW, how much Mac do I need to effectively run the current (May 2011) iOS SDK and IDE? Said another way, what's the least amount of hardware (CPU, Ram, monitor size, etc.) any of you experienced hands would consider using for iPhone app. development? Yes, I know it's subjective. I'm just asking for your subjective opinions. I just want to keep my costs down while I'm writing my first iPhone app. If I can buy used I will. If I can borrow a machine for a few months, even better. I just need an idea of how low is too low.