I have been in market for buying rMBP for some time. I'm planning on studying photography and Photoshop program in the near future. I can not afford the full CS software, but can afford "Photoshop element" I saw at the best buy for under $99.00. I am debating which model to buy and I'd like a recommendation. What I am thinking is... rMbp 13" 2.4ghz i5 dual 8gb memory 256gb flash memory. Then buy an external 1tb HD for storage (around $100?) Or Should I go with... rMbp 15" 2.0 GHz i7 quad core 8 GB memory 256 GB flash (Really pushing it with the price tag). Will 13" be fully workable ? What's your recommendation/experience ?