Dinner in SoHo -- Savoy or Quilty's
It is, of course, extremely bad form to make reservations that you don't intend to use. It leads to situations like the Bouley Bakery mayhem so amply documented elsewhere on this board. That being said, Savoy is truly a special restaurant, probably closer to the Cafe at Chez Panisse than anywhere else in NY, and definitely a leader in the responsible ag movement in NY state. Upstairs is especially nice, but downstairs is no punishment.
They are both great choices. I think the food at Quilty's a bit better, but it is a little more of a scene. Savoy has a very nice Mediterranean-style menu (and very good homemade cherries if you happen to order a Manhattan).
I don't think you'll go wrong either way, but if forced to choose I'd pick Quilty's (have the pork loin).