Don't underestimate a good SSD.
I find a lot of the time spent on my system is just waiting for all the textures to load up. My system has a really nice video card with quad core (pre-i series Intel Quad Core2Duo) and 8gigs ram, but after about 4-5 map changes the system just chuggs. An SSD just elliminates the time it takes to swap out textures, etc. Even a 128gig SSD is coming down in price all the time. Use the 500-1000Gig HDD as your secondary drive. Install all your apps except SWTOR to drive D:. Takes a little getting used too, but if you're comfortable working with files and windows applications it shouldn't be too difficult.
