Any web based proxy will do CGI seems to have the most support for server side scripts but glype and phproxy will be fine to. You could use a IP based proxy and these will do every thing you need you dont even notice your using them apart from speed is alot slower but wont effect you.
Where can you get these proxy's?
IP based proxys
To check the IP based proxy's use this site it's realy good
Hope that helps you out.