How about just picking a brand like Grandstream and the gateways Grandstream GXW-4024, GXW-4008, GXW-4004?

Also I would pay (obviously if reasonable) for phone support. I've been a fan of HostGator for years and have been pampered by the tech support I receive as a reseller. I am now using the chat more than the phone support but would really like to see something like this here for resellers.