I believe you can get a dual WAN router and utilize both connections. You won't be able to utilize both connections on ONE download, but if you have two downloads at once one download will use one connection and the other one will be able to use the other connection. A lot of people use dual wan routers as backups, but I'm pretty sure you can configure them to be utilized at the same time. I don't know much about this though, but I did a bit of research on it awhile back so technology may have changed. Google "dual wan routers" and see what you can find.
good luck
