Oh, I have a 560 ti and a I7. I was looking at SSD prices but they are way too pricey for me still.
The thing about an SSD is that you don't need a 1 TB SSD, you just need something practical like a 128 GB or 80 GB SSD. That way, only your Oblivion install is on the SSD.
I would also suggest installing Windows on another partition of the SSD. I love when the startup times are less than 20 seconds
BTW, SSD deals are all around. I have see them close to $1/GB, which is still the cheapest you see. Much cheaper than the 680 you were mentioning!