I just moved to Ma On Shan one week ago from the US and so far I am loving it. I also work in Shatin, off the Shek Mun stop. I am in a brand new building that is very "Luxe" and only a few minutes from the MTR. They should have 2 bedrooms within your budget as the one beds are on the lower end of your range. PM me if you would like more details, I would be happy to meet you for a beer and show you round.