I need to replace my i3 motherboard to upgrade video resolution. I'm now stuck on deciding whether it's worth it to go to i5 for faster OV3 and LR processing speeds plus faster transfer from one HD to another, or whether I would get a meaningful increase by choosing i7 over i5. I'm keeping my power supply, case, HDs and other peripherals. I'm going to stick with Win 7 64 bit. Your thoughts?