Agree with Dingo07. Go for the bigger size. I went from an Agility 3 120gb to Vertex 4 120gb and did not feel any difference. I have seen reports on the web that if you start filling up your ssd, it actually slows down ...not sure if there is truth to that.
I dont think SSD's will retain their value, not with OCZ discounting them so much as of late, which btw I am not complaining. I can now finally put SSD Agility 3 120gb in all of my 5 pc's at home
Can't wait to see what Black Friday brings.