SSD are nice, and "faster" ... and while decreasing loading times is nice it really doesn't come into play all that often. Just how many times a day do you re-boot your computer? (maybe once a month if we have a power failure for me....) Loading new gaming levels, that few extra seconds a HD takes to load give me a bit more time to rest.
Now if you update your GPU, you see a boost in performance in every game and every second you play your games.............
A 6950 is not bad, but Crysis 3, Battlefield 3, and Far Cry 3 will definitely Not be play on very high settings with this card. Go for a 7970 Ghz edition or GTX680 if they are in the budget.