Ok, so I was looking at the refurb store for a 13" Retina MBP, just curious if I get the 8GB model with the 128GB SSD are they worth the money? I like the fact there is an HDMI port right on the unit, just that the SSD's for these models are so expensive, I need to have at least 512GB or keep the 128 and use an external but just not sure if anyone found a cheaper SSD for the Retina units.