I would go with Yahoo Small Business. If you are going to go with a paid service, Yahoo is awesome.
Lots of disk space, great bandwidth and a really easy interface when it comes to managing files. There are 2 packages. The one I've used is 5GB of diskspace, 200GB/ month of bandwidth and free domain name.
8.96 for the first 2 months then 11.95 a month. There are 2 more packages that have more, one is called standard then professional. The price goes up to. You can check out the packages at the site.
I 've used Yahoo small business and they are awesome. No contracts, cancel at any time. You could use the domain name mympxplayerdownloads.org (I checked, its avaiable)
http://smallbusiness.yahoo.com