I've placed an order for a nMP ($3999) and I plan to get sell off either my 15" or 13". I'm mostly going to use the nMP for music production and video editing and some photo editing. It's hard to decide which macbook to keep. I hope some of you can help me decide. It's really a tough decision as one is lighter than the other and one has more performance than the other. P.S Specs for the mentioned macbooks are below my signature.