One bike is good but if I could have three, one would be a steel bike from Sacha White of Vanilla Bicycles, their alter ego of Speedvagen, or a Dario Pegoretti bike from Italy. (The second one would be a titanium bike from Moots and the third one would be a Parlee carbon fiber bike…ok, fine, and a fourth Parlee triathlon bike).
The bikes from these two guys are well built and just pretty — construction, paint job, geometry. Steel isn't the lightest frame material but can be made pretty light and supposedly the ride is fast, responsive, and fantastic. Steel is also supposed to be pretty durable and easy to repair.