I see no point in getting a 1tb ssd. 1tb won't fit everything so is as useful as a 256gb for me, I need external drives anyway. Get a 256gb and spend the money on either a fw800 external drive, or even better, a thunderbolt one
But to get the benefits of ssd performance, you only need the files you're using at one time (OS, apps, and assets) to be stored on it. That's why even 128 can be enough if you use external or remote storage.
I see no point in getting a 1tb ssd. 1tb won't fit everything so is as useful as a 256gb for me, I need external drives anyway. Get a 256gb and spend the money on either a fw800 external drive, or even better, a thunderbolt one