We went with the propane option in our house as well but decided not to purchase any appliances from the builder. Well, except for the dishwasher since it was standard. Otherwise we purchased and installed our own cooktop. My wife did her research and decided to with Fisher and Paykel model GC913SS
http://usa.fisherpaykel.com/global/kitchen-products/cooking/gas-cooktops.cfm?productUid=1E76C763-E0BA-FDEA-18936EE494254DCE