"He who marches out of step hears another drum." ~ Ken Kesey
If I were buying new, I'd probably get the 15" 2GHz one and increase the memory to 8GB.As it is I've got a 3-1/2 year-old 13" Macbook 2.4GHz with 4GB of memory, and I'm using CS5 without any issues. Any of the cheaper new 13" Macbooks would outrun mine. I do have it paired with an older CinemaDisplay which is nice, and I bought a bluetooth keyboard and "magic mouse" to use when I'm at my desk.This is where I buy my stuff typically: http://www.macmall.com/p/Apple-MacBook-Pro/product~dpno~8300859~pdp.gdchhcc