How to find the right drug rehab center?

Does anyone know of a website or service that can help me locate a good drug rehab center? A family member is looking to get help and my family wants to make sure he enters the best facility we can find. We're not looking for government funded facilities or out-patient programs, but a reliable inpatient rehab center. I'm not sure where to start looking, so if there's a site or something where I can narrow down the search by certain criteria or success rate, it'd be a lot easier. Thanks.