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You've already got the 15" MacBook Pro. There is no functional difference in portability between the 15" MBP and 13" MBP so you are spending money to buy a redundant machine. The only computer I would be considering for your usage is the Retina MacBook.
well, I owned 3 MBP 15" , 207, late 2009 and late 2011 (actually I'm selling the last one...) and I just bought the MBP 13": there is a relevant difference in portability.
Sure, the rMB is even better.
 
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