I doubt for your money you can increase your game experience much more then it is now. You could increase your all around performance with a Intel SSD.
Quoted For Truth. And yah - It makes a noticable difference in load times. Though not, as pointed out, in FPS once all is loaded and running.
On a cost per GB worth of storage basis, though, SSD's are VERY expensive. So the current wisdom is to use a Small~medium sized SSD (80~128GB) for your operating system and a key applications(games) for best performance. Then use a large capacity, standard (rotating) hard drive for your Data (music, videos, pictures, and whatnot).