I'll be in town for only one night and am looking forward to an omakase. I've heard Mondays are bad for fish, but I'll pretend they're aged better. ;)
Anyway, the places I've called have been no-gos so far (Nobu at Kanoyama, Sushi Yasuda is being renovated), and others seem to be closed or impossible to get a reservation (Nakazawa).
I'm more of a nigiri guy, but could consider kaiseki. Price not an issue, although I trend toward the premium if possible. I'm a big fan of 15 East, but somehow assume Masa-san doesn't work Mondays. Hopefully I'm incorrect!