My Dad's a doc, and I recommended an SSD to him. He has found that it has increased how many dictations he can do per day, and has greatly appreciated the boot times, and launch speeds.
I agree as well that a SSD shines more in a laptop...as my friend had a core 2 duo laptop on its way out...but he couldn't afford to get a new one....so he put an SSD in it..and it become faster then our friend's i5 laptop..(on everyday tasks that is)