I recently did the same thing with my new mid 2012 cMPB, although I only purchased the base model with the i5, and I went with a 256GB Samsung 840 Pro SSD.
I didn't use the computer for too long under the original 4MB or RAM and 5200 RPM hard drive configuration. That said, the difference in performance before vs. after the upgrades was just incredible.
I don't run a lot of applications that require significant processor and or GPU power, so I'm thinking I'm all set for the next 3-4 years with no problems 😀