I've been using Copy because they give a lot of free space, but not for many other reasons. Dropbox remains king - especially if you consider editing. The new integration with Office is very nice.
Hard to say what is best without knowing what your requirements are. However, I use Amazon S3 99% of the time for anything I don't store on a local server. There are apps out there that can allow you to mount as a shared drive. If you are a Mac/Linux user you can use fuse s3fs to mount as a filesystem.
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[ 2.8 ms ] story [ 11.8 ms ] threadI've been using Dropbox since, well... a while, and I really appreciate the cross-platform compatibility (Linux/OS X)