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For customers who need Active Directory sync, archiving, Blackberry Enterprise Services support -- and who have 50 PCs (or soon will), Office 365 for Enterprises is the most applicable Office 365 SKU.
There are two types of Office 365 for Enterprise plans: Plan K (for "kiosk" workers) and Plan E (for information workers). Plan K doesn't include messaging and collaboration features or functionality.
There are three different Plan K offers. Hosted Exchange Online only is available for $24 per user per year. Hosted Exchange plus Hosted SharePoint (Plan K1) is $36 per user per year. And Hosted Exchange, Hosted SharePoint and Office Web Apps access (via SharePoint) (Plan K2) is $120 per user per year.