My MB13 is collecting dust. I got a 15" Retina Macbook. Fully loaded 2.7ghz,16gb ram and 768GB ssd. I also have 3 other newisg macs in the house. I have an July 2012 Ivy Bridge 13" Macbook Pro I don't even use anymore. It was the base model but I upgraded it to 16GB RAM, 512GB M4 SSD in the main bay, 750GB Seagate Hybrid in the cdrom bay. So it is a pretty loaded. I was thinking of trading it for an 11" Air (just to have for the small size). Should I trade it for something like 8GB RAM/128GB similar vintage, Ivy Bridge or flat out sell my MBP13 for $800 or so and go out and buy a Haswell one and pay the difference? P.S. I am not interested in trading/selling here. I was going to do it on craigslist.