I have a Corsair 128 SSD from the time I bought the MBP. It was a nightmare to make it work with sleeping. It had a known bug that was corrected after almost a year by Corsair with a firmware update. After this it has worked flawlessly.
The machine has 8GB RAM and it is still very fast. It is the last model that came with an internal DVDRW drive, something that I still appreciate and still use sometimes.
The hard disk is now very small to hold OSX, programs and pictures. I am constantly deleting things so it has come the time to upgrade. I want a >500GB SSD drive to replace it, and I want it to be fast.
I appreciate your recommendations as I am not sure if the best drive recommended in TR articles (I am just going to start to read about the topic) is going to be good for this notebook.