That is too much to answer here. It depends on the size and electrical needs of the house you are building. Most are built with 200 amp service. Many used to be built with a 100 amp service and they get by just fine.
Service entrance cost goes up dramatically beyond 200 amps and I would go to 400 with 2 200 amp panels before doing 300. The higher you go, the bigger and costlier the service entrance conductors, meter housing, breakers, etc. get. Good luck.