I have a 2012 non-retina 13 inch MBP, with 8 gb RAM and 256 gb SSD storage; 2.9 gHz i7 I'm thinking of upgrading to the Haswell 13 inch i7 2.8 gHz with 16 gb RAM and 1 TB PCIe flash storage. Does this upgrade make sense to anyone here? I really want more storage, and the retina screen. will doubling the RAM be noticeable? I'm not really a "power user", but I appreciate quick response time. Is 1 TB that much faster than 512 GB? Apple is offering me $675 for the 2012, is that a good deal? I'm annoyed that they want me to ship it first before I get a store credit to apply to the purchase. What's a good alternate resell option?