Based upon the three speakers on your list, I agree with Buff. (Note: I have not heard the Proac D80 though.)
The Avalon Eidolon is a really special speaker. It sounds great, and works well for any music, not just classical, (although, I will admit, that it does sound fantastic when listening to classical). It is very transparent, and tonally is very neutral. It is not quite full range, but pretty close, especially if driven with a fair amount of power (say 200+ wpc). (FYI, they are so transparent, that if your upstream electronics are not top notch, it will reveal that, and therefore may not sound as good as they can sound. This is not a criticism, just a statement; Most, (all?), highly refined speakers exhibit this characteristic.) Also, notice what Buff said about being properly placed. The Eidolons like lots of space around them, so be prepared to pull them well into the room, and kept well away from the side walls.
The B&W 802D is also a very good speaker, with a very highly refined treble response of course. However, it is even less full range as the Eidolon is, nor is it as transparent, at least IMHO. This is certainly a good (and close) second choice, if you can not find a pair of Eidolons at a good price.
My two cents worth.
