To answer an earlier question - yes, only interested in piano versions.
I am not familiar with Sheppard, but I see I will be able to sample his work, so I will give that a listen when I can.
I am less sure of Tureck who some like. I have some works with her (WTC for example), but am not entirely convinced. Without getting into nitty gritty, I think piano Bach needs some extra...how to say it...oompf with a light touch? Schiff often does it (one of the reasons I didn't like his Beethoven from the little I heard - too much of a light touch, although the flip side is that it could be incredibly revealing). Tureck, for me, has some incredible moments, but I don't always find myself engaged.
Just as an aside, the reason I became interested in Bach on piano again was in part due to hearing volume 3 of the Bach transcirptions disc with Piers Lane. It was fantastic and reminded me how much I loved Bach (who I haven't listened to much recently). I'd forgotten I picked up that disc.