If anyone is having issues with gamefront using US proxies seems to work, as I discovered while modding other games - I use this list:
http://www.proxynova.com/proxy-server-list/country-us/
Ones in Texas seem to be fastest. I find they're faster than using proxy websites.
Also turns out that the list of countries that can't use gamefront is even bigger than that:
http://www.gamefront.com/file-hosting-faq/