craigb
Hmm... I've got that one as well as two others (which I think is all he's produced), so now I'll have to go back and re-listen. I remember liking it, but not as the best Prog album for almost four decades. I've got so much Prog now that I don't even think I'd want to nominate just one as better than the rest! 
Yes, a bit of a sweeping statement from me I think. Of course as usual "best" should be substituted by "favorite".
For me, Prog seemed to implode around 1975 when the first wave of bands began to run out of ideas, hardly surprising when you look at what happened in the preceding six years. The revival was slow in coming.
There is a lot of more recent good stuff, but "Raven" is my favourite. Other contenders include Big Big Train, Touchstone, Panic Room, Mostley Autumn, Ian Anderson, Karnataka and Syzygy.
I quite liked "Fly From Here" by Yes but found the new album disapointing.