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SugarSync is a tempting option from a feature standpoint. The most interesting feature (to me) is their Outlook attachment client: It plugs into Outlook and, rather than sending attachments through the e-mail system, puts them on your SugarSync share and includes a link. For heavy Outlook users this could make SugarSync a good option. Note that HighTail (formerly YouSendIt) offers a similar feature with their (not cheap) paid plans. I expect that, before too long, this capability will become de rigueur for companies, like Microsoft and Google, who offer both cloud email and cloud storage.
SugarSync allows not just undelete, but they maintain the last 5 versions of a file, and only the most recent version counts against the storage limit.
But SugarSync is really expensive, in some configurations the most expensive option here. Their prices don't get good until you get their business-oriented (1 to 3 users) 1TB plan and, at that point, they're even cheaper than Google Drive.
|Storage (GB)||$ monthly||$/GB monthly||$ annual||$/GB annual|
SugarSync has an interesting client collection: iOS, Android, BlackBerry, Symbian, and Windows Mobile (NOT Windows Phone, and no third parties have picked up the slack there).