Thanks for all the replies!
Let me explain a little - I'm in the market for a new pre-amp with almost no budget constraint. I've heard many of the pre-amps I listed, but not in comparison to one another, except for a couple though not extensively.
I left out from my list some obvious brands, like BAT, Boulder, Einstein, McIntosh, LAMM, Linn, Levinson, because I don't particularly like them sonically.
Having said that, I guess it was obvious to me before my post, and now after so many replies, that choosing from that list is probably a question of "flavour" rather than finding one Good-Better-Best among them.
With that in mind, do you think we've reached the age of Renaissance for Pre-Amp designs? Are there any new designs that leapfrog all these top machines?
Andrew