This move from Amazon sparked me to revisit the cloud storage options out there and ended up with Google Drive. As a longtime Dropbox user, I've always used them and never looked at other options because of their awesome desktop client, but they are really dropping the ball when it comes to competitive pricing. So I'm happy to say after installing the Google Drive desktop client, it is pretty much on par with Dropbox, and both are way ahead of Box, which is slow and buggy.
Some of my findings...
Dropbox
2gb - free (can get up to about 5-7gb free if you do a bunch of stuff)
1tb - $10/month
Cons: No 100gb pricing option.