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In terms of pricing and range of plans, Google Drive is hard to beat. Nobody comes close to their range, nor does anyone offer anything like a 16 TB plan. They also offer monthly billing at the same flat rate as annual (making annual pointless if you ask me). It's not the cheapest, but it's not off by much.
If you're plugged into the Google ecosystem, then Drive is a natural solution. Obviously Google Apps works with it directly. Google Drive really could be a good solution for me. There's no official Windows Phone client, but there are several unofficial ones (such as this one) that seem to do what needs to be done.
|Storage (GB)||$ monthly||$/GB monthly||$ annual||$/GB annual|