MultiPoint (already preconfigured with Remote Dekstop Services, you just have to switch on RemoteApp) and Standard (install Remote Desktop Services and Remote App).
WHS 2011 -> No
SBS 2011 Essential -> Already a domain controller, highly recommended to not install RD Services and Active Directory on same server.
Server 2012 Essentials -> Same as SBS 2011 Essentials
This is where Server 2012 Standard is useful. You get to two virtual instances so you could make one instances the Domain Controller/File Server and the other for Remote Sessions.
SBS 2011 Essentials/Multipoint Premium 2011 and Server 2012 Ess/Multipoint Premium 2012 are also good combos. They integrate into the dashboard.