BWV 999 was my first, it's such a pleasure, then 846 (wtc 1), and this year's project was 1007 and have it down as well, but after hearing Mearns' version with a whole bunch of the implied counterpoint filled in, it's almost embarrassing to play the original now. I'm thinking my next project is his bwv 847, and I have been warming up to it by slightly rearranging bwv 846 by adding an alberti bass note via a sort of travis picking technique, akin to what Mearns did with his bwv 1007 arrangement. Skill wise, the Chaconne is probably a decade away for me right now, but this winter I may get his wtc c minor prelude down, then go back to foundations with instruction again so I can tackle more serious pieces. To play CG well takes everything, and its been a long time since I gave that to something. Glad to see someone else take it up a bit later as well.
Happy trails! :)