(Candidates are: Vishy Anand or Boris Gelfand, Magnus Carlsen, Lev Aronian, Vladimir Kramnik, Peter Svidler, Alexander Grischuk, Vassiliy Ivanchuk, +1 organisers choice which I'm ignoring as unknown)
I vote for:
Vishy Anand (reigning world champion, sorry Boris)
Judit Polgar (top woman player ever)
Hou Yifan (womens world champion, player of the moment, might be about to take a step forward in level)
Alexander Morozevich (pretty much guaranteed to have lots of interesting and decisive games)
Anish Giri (very young, very strong. Comes across as a nice guy, and a tactical move to suck up to the Dutch ahead of Wijk!)
I'd have liked to invite Victor Kortschnoi, but perhaps a little too strong for him
