I can only give the advice I have from my short time of experience, but going though a local LBS is always a good plan. Usually they throw in some free gear or give you a discount on helmets and such if you buy a bike from them.
Other Viable options are the KHS, the bianchi pista, the surly, or an IRO. I know INKDWHEELS on here is weighing in over 200 lbs and he rode a IRO steel frame with no issues. My recommendation would be a steel frame, maybe even an old road conversion to start out with.