Personally, I'm with bostonsparky on the fit thing; that is, I think I could adjust to any of the top schools' cultures/locations and have a blast. If you really feel uncomfortable at one school, then definitely rule it out. I think Cornell’s admit weekend will clear that up for you though. For me, the decision is mostly about career opportunities.
A quick example that seems relevant to your situation: I tentatively plan to target IB. Kellogg and Booth are at the top of my list (behind HBS and Wharton). Just looking at those two programs, there are two schools of thought with respect to IB recruiting:
1) Chicago is a core finance school, so you will have more opportunities to break into IB there, especially during down economic times.
2) Kellogg is not a core finance school; but since it is still a top program, banks will not drop it from their recruiting list. They will probably take less people compared to the core school, but there will be less people going for those spots.
Cornell is the Chicago in my example. Darden and Ross are the Kellogg in my example. Since I haven’t made the choice yet (mostly because I haven’t been admitted to Chicago yet), it’s hard for me to say what I’d do in your situation. I think I would probably choose Cornell unless you hate it during the admit weekend though. It seems to have the best name in the IM industry. It also seems to have the best curriculum and programs (Cayuga fund, Immersion, etc) for your interests. I wouldn’t worry too much about the lack of west coast presence right now. I think you should focus on the short term goal when picking a school.
All that being said, I’ll tell you what people keep telling me: “you can’t make a wrong decision, so just go where you would have the most fun.”