Which amp should I use for my B&W Nautilus 805?

Of the ones you mentioned I prefer the Classe, especially with your speakers which are quite...revealing.

A beter option would be the Blue Circle integrated. If you wait around you can find one realy cheap and send it in for upgades or remote etc. Check out www.bluecircle.com
Vik

Well what you might consider revealing I might consider ruthlessly bright. If you were asking for my opinion on the tonal balance of the Nautilu sspeaker you have I woudl say it is a bot bright. *I* would prefer to match it with a smoother sounding integrated. Classe is pretty smiooth, but the Classe power amp was so smooth to be tasteless and kind of bland. I prefered the Rega integrated amp to it as long as you have a small room. Rega gear in general is well priced and since I feel your speakers like some juice maybe the Exxon monoblocks would be a good idea. I think you may need to go and do some audtioning. There is only so much info you can gather from these boards.
All the best,
Vik