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If you decided to play game on your rMBP in the future I think 16GB is the best because I have 2012 rMBO with 8GB, 256GB SSD I am not sure why one of games crashed to desktop screen I assumed 8GB is not enough (I could be wrong). :apple:
 
My parents ended up getting me the rMBP 13" 256GB (I think) 8GB RAM model.. late 2013.

It's pretty nifty. I strangely still miss my previous MBP for reasons beyond me...

Anyway, the retina is really nice. It's a huge difference!
 
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