What Will modestly doesn't mention is that he has also simultaneously been learning and playing a swag of other pieces written by members on another thread on that forum. These include three of mine which had only handwritten scores and are not particulaly easy to say the least.
Since my random shuffle on iTunes was playing a very nice prelude and fugue when I clicked on your message - I thought that was a sign I should nominate it: Book II - No. 11 in F major. The version I have is by Vladimir Feltsman who has a very nice touch for Bach. Good luck on project it sounds incredible! And incredibly difficult - how are you going keep all those voices in your head without going crazy?
I really like the one in A minor WTCII.Also the one in G minor. WTCI.
(eyes look through the kitchen window)
I have a project for your next summer: Scarlatti.
My favorites are Bk 2-E Major, bb. Bk 1- a.