Are you still on XP Pro or Vista? Do you want to standardize on a single version of Windows?
Did you know that Windows Intune includes upgrade rights to Windows 7 Enterprise? Meaning you can upgrade to Windows 7 Enterprise and dont have to purcahse the upgrade license as its included with Windows Intune.
Looking to upgrade to Windows 8 when it releases? If your Windows Intune subscription is still active when Windows 8 releases - you get rights to upgrade to Windows 8.
Purcahse Windows Intune or try it out here: http://www.microsoft.com/en-us/windows/windowsintune/try-and-buy.aspx