Full Cloud Storage Options to Replace Local Server

I have a very geographically-dispersed client that currently runs an in-house server at one location.  

The client is a marketing firm and the users tend to work on various projects on their respective computers and then upload the completed projects ( sometimes 100GB in size ) upon completion.

Their current storage runs close to 2TB.

Currently, only users in the main office access those shared files but that will be changing and users from across the country will need access.

I have searched for a few different options and can't locate a suitable solution.

Box.Com was reasonable, though they charge a fairly large fee for initial seeding.

Rackspace is a solid solution, but their pricing structure is based on storage + bandwidth; we are interested in a simple, not-changing fee structure ( ie., Rackspace cost would change every month depending on how much bandwidth was used ).

Any solutions would be much appreciated!
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So what kind of budget?
Amazon Cloud Storage
Google Drive
Depending on your needs I suggest you visit the link below to compare Business Cloud Storage Services:

I would take recommendations from a site that gets paid to advertise products and/or makes money off links with a very large pinch of salt.
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OllarConsultingAuthor Commented:
Budget is probably up to about $400/mo....
Amazon around $1000/year
Dropbox from €60/month for 5 users

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OllarConsultingAuthor Commented:
Dropbox is the apparent way to go...
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