How much bandwidth are you using on a monthly basis? Could you host this at your home or office? If that is an option then you could build your own box and make it as hefty as you wanted (and it doesn't have to be all that expensive depending on how much traffic it gets).
My upload isn't good enough for me to host my own files. It's only 2mbps up and I need minimum of 10mbps because of the data transmitted (images of pets & photos for a project I did). I thought about Amazon but their pricing is kind of high compared to other services I have used. Services like Rackspace Cloud & Storm on Demand have free inbound traffic but the storage space is not as flexible as I would like.
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