I have a base first gen 15" rMBP mid-2012. The 256gb isn't cutting it. I want a 1tb drive. At OWC I can get just that. But is it worth it? I'm also considering selling the MBP and my rMB and getting a 13" rMBP with a 1tb drive and 16gb of ram. I'm thinking the cost would be similar between the two options. What would you do?