We have a Buffalo Wireless-G Ethernet Converter. It will reach through out our house of 2200 sq ft. We have not had any problems with it and we often have 2 or 3 computers on the internet at one time.
We lived in Germany 2 years ago and had another brand. We were told it would work in the States, wrong! So be careful if you are moving out of country what will work and what will not.