I've been using resellerscene for about 8 months and would recommend their service.
AFAIK, they allow overselling - not sure whether they themselves oversell or not, but I've found their uptime to be quite good. They do have a 10 GB / 100GB reseller account available - u could check with their live chat to satisfy yourself.
http://www.resellerscene.com/index.html <--- Direct link, not affiliate
