If you like wonton noodles, I highly recommend the following:
- Mak's Noodles at 77, Wellington St, Central
- Wong Chi Kei at 15C (or B - can't remember, but look out for that name), Wellington St, Central

For dim sums:
- Jade Garden at 1, Hysan Av, Causeway Bay. This might not be one of those super cheap eateries, but it's not expensive either. I filled myself up with 5 fairly big dishes, including dessert, and paid just slightly over HKD100. It also has another branch at the Tsim Sha Tsui area, don't know the exact address but google's ur best friend.

Most restaurants in HK are used to tourists and supply menus in English.