Even if you could, you will need to get to the server using your local Internet Provider so all the traffic will pass thru both your dedicated server and your local internet provider. It depends of what you want to do. If it's to browse the Internet, one thing you can do is use a Windows Server and log into Remote Desktop and lauch Internet Explorer from the remote desktop ... but the user interface will be kind of slow. Explain what you want to do exactly, maybe we can understand and find other alternatives.
as far as i know, videotron is 6.5mbit unmetered...and i think a 500gb server would be perfect to proxy all your data (you dont have much choice, have to use videotron to reach your server unless you can lay your own fiber lol) unless the guy downloads more than 250gig a month, it should do the trick