I just sold my 2009 MBP and after looking at the refurb store I'm wondering what performance differences exist between the latest and greatest rMBP maxed out with 16 GB RAM and a 512 SSD vs. a 2012 MBP with 16 GB RAM and my own Crucial M4 512 GB SSD. The 2012 only has 512 MB RAM on the GT650 compared to the 2013's 2 GB on the GT 750. The 2012 refurb is $1449 and the Oct '13 retina is $2199. Aside from the screen, graphics card, and AC WIFI, the internals (processing power/speed) seem to be on par. Wondering what the extra $800 is buying me aside from the aforementioned screen, HDMI, etc. The larger question is are these two machines fairly equal aside from the new form factor? Benchmarks are pretty close but there's no way to know as they don't test the old machines with user replaced SSDs. If I get the 2012 machine it'll be almost two years old in June...not the exact machine, but the tech...although it seems tech hasn't improved a whole heck of a lot since then. Thoughts? Cheers! Edit: forgot to mention, both are 2.3 GHz Quad Core i7s.