I'm not sure what you mean by "Dieterich" being old-fashioned. It was the spelling he himself used, so I guess it's old-fashioned in that sense, but it has only relatively recently come into use again (see https://books.google.com.au/books?id=qSXGOoambNcC&pg=PR15&lpg=PR15&dq=dieterich+buxtehude+spelling#v=onepage&q=dieterich%20buxtehude%20spelling&f=false)
This doesn't seem to get a lot of traffic so I doubt this'll get answered, but can anyone tell me who the best performers of this stuff are? Like who's interpretation should I go for? I don't want my first real listen to this to be tainted by shoddy performance the way Satie was for years.