I have Preston's complete Bach organ works boxed set (currently going for about £30-40 on certain well known websites) and it's very good indeed. Penguin Guide also rates it very highly, if that means anything to youI haven't compared it to the Hurford, which I imagine will be similarly good, but I definitely haven't found anything to disappoint me in the Preston. They were recorded from about 1988-2000 on various European organs. There aren't any jarring shifts in sound from one organ/location to another, which I think is a good thing, though others may disagree.
Ultimately, when it works out at less than £2.50 per disc, there's an extent to which you can't go wrong.
Mark
