Yeah, I think a top 3 would be more realistic.
And are you going on sound or looks?
I probably wouldn't place many modern, digital desks in the top 3 for sound.
My list in no particular order:
(Rainbow Studios model?)
1970's Cadac (Wessex Studios model?)
1970's Api (a 1604 would be nice to own).
Of course a couple of the classic Neve desks that reside around the world would probably trump my top 3.