Quick question. Plan on using the new rmbp for school. Using it for sketch up, autocad, revit, 3ds max, Photoshop, indesign, and illustrator. From my understanding I should really focus on the cpu and not the gpu. Will the iris pro suffice? Also is the cpu between the 13 and 15 in that big? If I need to focus on the cpu should I just get the 15in? I do prefer the smaller form factor.
I also want to have an external monitor. Probably something 4k, hopefully an apple Thunderbolt Display if it's updated. Do I need a gpu for external monitors? Don't really play any games.
Also do you guys recommend apple care? Didn't get it for my base air from 2012 but the rmbp will probably cost atleast 2x
On getting AppleCare...I think it depends on the machine you are buying. If it's a 15" with a dGPU, definitely get the AppleCare as Apple's track record with dGPU's in MacBook's is poor and a logic board replacement will cost a lot of $$$ out of pocket. With other machines, it might be a different story. I'd still recommend it though, particularly is you plan on keeping the machine three years as you just never know.
I got it with my early 2011 15" and I'm glad I did because my MBP suffered from Radeongate and I needed to use it to get a new logic board.