brash_stryker said:

I've had noone telling me not to, under any circumstances, use prores422 (HQ) so I assume it's ok, though I'd really like the best one for my purposes.

Having said that, I'm toying with the idea of, using filters to give the film a colour depth/grain more like what you'd see if they were made in the 70s like the originals. Anyone got any ideas how this might be accomplished?

There is a grain filter in FCP but you could probably find a much better one somewhere on the internet, problem is, it might cost you

This might help:

http://www.youtube.com/watch?v=KelM0emjEKM

Here's what I was able to get using similar techniques