So I am going to be buying an iMac for Xmas and I will be mainly using it for my photography. I do not understand which I need more on the desktop to hold my photos. The ram or the capacity? And if the GB is higher than the TB. Anyone know this stuff and is a computer techie that could help me out. I am going to buy my desktop from B&H Photo because they've got better deals than the refurbished ones on Apple. Thanks!