Hello guys! 4 years using a Macbook6,1 late 2009 2,26 GHz Intel Core 2 Duo with 4 GB 1067 Mhz DDR3, nothing to say about it, I am very satisfied with it but time has changed and i need something with power. I am an architect and i use programs like Autocad and Archicad that don't run very well in my actual mac so i wanted to ask you for help. I am between 2 Retina MacBook Pro, both 15 inch, but different processors, 2.3 GHz i7 quad core late 2013 i think and a 2.5 GHz i7 quad core new retina macbook pro , both have 512 GB flash and 16 GB Ram. the most important difference between both is the price of course, do you recommend me a little bit more processor or do i go for the 2.3?? or another option could be to wait for a new release!