I sat down with Conde Naste's Traveler March 2006 and inside there is an article that describes the best cards for a traveler's travel goals. It also cites webflyer and flyertalk. There is a very easy table to refer to as well.

For me the best set up seems to be

get the Starwood amex
keep the delta amex
keep the AA m/c

It is worth the read. I can't say that it makes sense to me yet, but hopefully I'll get there.

C