I thought about SSD just on Boot Disk, but then when I am not near my external for itunes, it would be a pain, and SSD are still really expensive right now, I mean $400-600 for a good 256GB is a bit much. I looked at the new 512GB models and they are $,1400+
My iTunes library and everything else brings me to about 480GB used so I need 500GB or more.