Keep the wheels you have, 1900g is not even that heavy. Especially at your weight. The only thing holding you back now is inexperience and aerodynamics.
It blows my mind that anyone would recommend less than 32h wheels at more than 200lbs. The 36h FRONT wheel on my Long Haul Trucker weighs more than both wheels WITH tires on my Fuji, and guess what, I can still ride that bike 30mph unloaded on the flats. I'm one of the "2 pounds per inch" guys so maybe I shouldn't speak for the fatty's
