Do you know of any company that offers unmetered bandwidth reseller hosting.
I am unsure of how much bandwidth i might consume, so I would like an unmetered bandwidth reseller account.
I might push about 400 GB of bandwidth per month.
I'd require about 10 GB - 15 GB of space.

You should also ask sales on the connection the servers are put on. Cuz if it's a 10 Mbps connection on a busy server that unlimited bandwith won't help your case.

Maybe you should start to look at vps's?

Are you hosting a forum/blog etc or static files like html/files?