getting a reliable proxy reseller hosting is really tough , since proxied use a lot of resource , if some one offers you please take care inquiring server specs and number of clients
Some hosting providers may provide 500 - 600GB bandwidth for proxy reseller but it really depends on your budget. Can i know what is your monthly budget? If you have a good budget i would suggest to start with a vps server, you will be allowed to use more resources as compared to a shared server. Best Regards Wajdan
It's possible to get that much bandwidth on a shared environment for proxies but it will be pricy. I'd say it will cost you anywhere from $40 - $60 per month if you're looking for a reliable provider. However, if you're going to pay that much, might as well go with a VPS, right?
I offer 30GB Disk, 300GB Bandwidth for $14.94 a month. Master Reseller with proxy support. http://forums.digitalpoint.com/showthread.php?t=1434833
I would recommend you VPS instead. For the such ammounts of the bandwidth you will feel better with the than with reseller account