As an aspiring music producer, I decided to buy a MacBook Pro with 15-inch Retina Display (since its the only MacBook with 16GB RAM), but I see there are two models. The differences between them are: 1) The processor (but I dont think the user would be able to perceive any difference in speed because of this, do you agree?? 2) Storage: 256GB versus 512GB (!!) I think storage is the only significant difference. But the option with more capacity is way more expensive. Since I dont think 256GB is enough to manage my music, should I buy the 256GB option and also buy an external drive, or do you think the 512GB option is worth the price? Will I have any potential risks with an external drive? (I never used MacBook before). Thank you so much!