Copy had the best Linux client besides DropBox, and a pretty generous initial space offering. Shoulda seen this coming. DropBox is pretty darn good, I just wish they offered more free space.
As far as alternatives go, Box gave the most free space, but it doesn't have a Linux client, and though I can mount my Box account via webdav, it's just not the same as a nice app that can easily generate share links. SpiderOak is nice for the encryption it offers, but good grief is it ever slow... Owncloud and Seafile are nice and certainly have their place (I have both on a spare box I also use for serving Minecraft and Teeworlds), but I don't keep my server on 24/7, so a personal cloud is not really a viable alternative.
Sigh. One more down...