Well, the hard disk is the slowest part of your computer. Also, an SSD will make no noise, generate less heat and consume less power than a regular HD. It will not only help with Blood Bowl, but with loading times in any game. And it will greatly improve the snappiness of all other tasks.
I agree that compared to a normal HD, they cost a lot, but I would not like to miss mine (and I bougt the very first Intel 80GB SSD for like 400$). A 64GB Crucial C300 is enough as main disk (OS + programs + a few games).