If you have the extra cash SSD is the way to go right now.
I would have a smaller SSD - install Windows onto that, and then have a larger (cheaper) drive store all of my data -- maybe 1 or 2 TB. If you dont have a ton of data, I would get two or three 10k drives and raid them together along with your SSD.
It all depends how much $$$$ you have to spend - can you throw down an estimate?