Pfffffftt!
Shoo expensive bikes, stay in dreams! City streets are no place for you to be ridden on a daily basis!
Cost effective = Steamroller. These friggin things were made for the street. C'mon people...
Dream bikes always rule, but when buying a frame, I keep in mind what I will be doing with it. For me, this is 25-35miles/day on Chicago streets. Buying a high-dollar frame would be nice, but keep in mind: track bikes were made for Velodromes, not potholes.