to me the cost of an SSD for the little amount of space you get just doesnt make me want to buy one.
I understand where you're coming from, and somewhat agree with you, but I will say this: when you play WoW on an SSD for the first time, there's a good chance you might shit yourself. Needless to say, you'll never want to go back to a slow mechanical HDD again. If you can afford it, try to spring for a 120 or 160 GB SSD for your OS and WoW, and get a 1TB HDD (which can be had for under $100) for your music/video/etc.