I am ordering a new 13" rMBP in the next couple of days. The base model has 4GB of RAM and 128GB SSD. The next model up has 8GB RAM and 250GB SSD and I cannot really afford it. My plan was to just get the base model and upgrade just the ram from 4GB to 8GB. Now since I am taking a "base model" and upgrading the RAM...is there more of a chance that I could have issues with the computer? Not exactly sure how the production process works so I am wondering if I would be better jumping up to the more expensive base instead. Cause then it is not a BTO...Maybe I am just thinking about this the wrong way. For some reason I am thinking a "base" model would be less likely to have issues than a base model that I chose to have the RAM upgraded in. Let me know your thoughts. Thanks