I think I couldn't not be a "Bach" without a previous "Buxtehude"... Surely Bach developed all the aspects of organ composition, but a lot of ideas, solutions and suggestions became from Buxtehude.
This intense pieces remember a lot (not only for tonality, but especially for atmosphere) the BWV 641 http://www.contrebombarde.com/concerthall/music/29913
I hope you like its rendition