The SSDs that apple uses are slow and overpriced, instead of looking at a MBP with an SSD, look for a refurb or a used one without the SSD, and then figure out how much the SSD you want would cost and redo the math.
You could buy a new MBP, if you are like me and it bothers you not having i5 or something silly like that, or if you don't care, just go with the older one and stick whatever parts you want into it. It's your money, depends on what you want to use it for. Unless you are a pro video editor or do really specialized tasks for your job EVERYDAY, then don't get the new MBP.
Making a movie and mixing a song doesn't warrant spending 400 more on the newest MBP lol.