953 or Ti?

As far as I know yes. Last time I checked was 6 months ago when I asked for my new bike to be fully 953 and was told that the forks would have to be 753 as Reynolds had not made the tubing available for 953 forks. About a year before I was told the same in relation to chain stays.

Mercian mention that "most" people go for reynolds carbon forks on 953 frames - the pic on their blog does look nice