Would it be worth it to put the money i save from that into a ssd or better cpu?
Yes I think it would be a great idea to add an SSD. It will speed up your boot times and will reduce the time you have to wait for game levels to load. I would stick with a Core i5-3570 CPU and put your extra cash into an SSD. If you are going to include an SSD it makes sense to do it when you build the machine (rather than adding one later) because this way you can put Windows on it to speed up the computer no matter what programs you are running. If you are only concerned with gaming FPS then the videocard is the best place for your extra cash.
Not worth getting an SSD under 128GB (~$110) unless its for caching purposes, it will just get used up too quickly.
And as Max pointed out, an SSD wont help in gaming performance. Better off with the more powerful GPU.