Well, I'll state that Kalanyr is a good candidate. He's a bit harsher than most people about 'balance', but at the same time he has a pretty good perspective on all of the paths and how things interact.
Also, Reiella is quite a good candidate, but I'm not sure if this kind of responsibility would be too much considering how little action Rei is involved in.
Darkwolf also has a good understanding, but to my knowledge he's had it very busy for the past few weeks...
And I'd love to see Sabaron as Grand Master, but theres that issue of his working and lack of time to really be involved.