I'm about to buy my first Mac and I don't know too much about this stuff, so I thought I ask some experienced users. I want the 13" Macbook Pro 2.5GHz dual-core Intel Core i5. Should I upgrade the RAM to 8gb or upgrade to a solid-state-drive? Which upgrade would give me the best performance without spending more than $1500? Or would it be best to just get the 13" 2.9GHz dual-core Intel Core i7? I dont want to wait for the 13" Retina because I'll need it before I go to college and who knows how expensive that will be. So any help would be great. Thanks!