You all would be better off just getting a few cheap vps servers with extra ip's and then setting up squid and allow for only your ip. If you do not know how to configure squid I can help you out. It is crazy how many people are selling private proxies that are blocked by 50% of the internet. If you plan it out right you can get 1 ip per us dollar by doing it this way and you are in control of who is using your proxies. Just thought I would throw it out there. I use my squid servers to do other things also. Setup catch all's and host landing pages. Many things. Of you find one gets blocked you just kill it and get a new one. Only takes about 5 mins to setup if you know what you are doing.