I think the only option for an SSD is OWC as Apple does not use any sort of standard SSD. Would be nice if they adopted some standards options out there like the M2 hard drives, they are smaller then a RAM stick.
I looked at this a while ago and it does look like a pretty simple upgrade. Good luck!
“If you are neutral in situations of injustice, you have chosen the side of the oppressor. If an elephant has its foot on the tail of a mouse and you say that you are neutral, the mouse will not appreciate your neutrality.” Bishop Desmond Tutu