I'm one of the founders of Screenlight.tv. You might want to give our service a shot. It's $9/user/mo. and clients can review without having to sign in or create an account.
We have a resumable uploader that also accelerates media uploads. An upload that is initiated in Australia will send the file over the Internet to a location in Sydney or Melbourne. From there, the file will be transferred over a privately managed network to our storage location in Virginia. The net result is that uploads are speedy and very resilient.