More RAM or Better Processor?

I plan on getting the 15' rMBP relatively soon (Hopefully after WWDC).

I understand that upgrading parts after purchase is not possible, which has led me to a dilemma. Since I am getting the 512 gig SSD, I can only either upgrade the RAM to 16gb or the CPU to the 2.7ghz (or whatever the equivalent after the rMBP refresh).

I plan on using the computer for some gaming, school work, and possibly some engineering applications. I plan on primarily using windows 7 in boot camp, or at least for when i game or need to do work.

thanks

 

I might just go that route, as it's only an extra $100