Film student. What's recommended of the Macbook Pros 15"?

I'm just about to purchase my first laptop, but unfortunately do not speak computer language. My alternatives are the two 15" Macbook Pros with Retina display.
The only difference I can see is that the more expensive one has higher GHz (2.6 compared to 2.3), a higher TurboBoost (up to 3.6 compared to 3.3) and twice the flash storage (256GB compared to 512GB).
I will use it for Avid, but other than that I won't use it for other than web browsing and word processing software. I plan to purchase an external hardrive as well to save all my video files.

Would you recommend me to get the one that's more expensive, or don't you think it will matter?
I plan to prepare for post graduate studies, and that's why I want to purchase a new Mac.

Appreciate all responds, thank you!

Mac

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