You really get worked up during these tuning threads, don't you?That's a nice idea.
We've already mentioned a similar idea, using a fourths/fifths combination, similar to Open C tuning, such as BEBEBE, or CGCGCG.
Interesting point, but I've spent a lot of time playing in DADGAD on the acoustic guitar over the years, and it's easily one of my favourite altered tunings (in Celtic music it's almost and alternative standard tuning). I've found having the whole step between the 2nd and 3rd strings is great for chords, and actually resonates nicely, particularly if you like a lot of sus chords.
So, what about CGDAEF#? This would give you all the benefits of fifths tuning, but would allow you to fret close-voiced triads easily on the top three strings. The more I think about this one, the more it appeals...man, I wish I had a hardtailo guitar with me...
Alternatively, if you're going to go with the fifths/thirds idea, how about BF#C#FCG or AEBEbBbF, as this would put the third in the centre, giving the fretboard a greater sense of symmmetry.
Another idea, based on the fourths/fifths concept, would be AEBAEB; only three strings to learn!
The more I think about it, the more the CGDAEF# tuning appeals...I may take the plunge and slap it on my acoustic tonight...