I'd say it really depends on what style of food you're going for. Your budget is pretty wide open (which is good) so, you have a lot of choice. I think Otom has a nice open space, and their "contemporary comfort" food would be a nice choice for this kind of dinner. Plus, they were very attentive to our group when we were there; I have no doubt they would do the same for you.
I think Spring leans a little more to the contemporary side of things, but their food is definitely good, no doubt about that. I have no other suggestions, really, but it looks like you're on the right track.
-- Nora --
"Great food is like great sex. The more you have the more you want." ~Gael Greene