Home Premium will be OK... IF you are a basic pc user
With Ultimate you can make use of stuff like - Bitlocker, XP Mode, Backup / Restore up files over the network, join work domain networks, file encryption, have more than one physical CPU in your PC, offline files, presentation mode, Applocker, support for Unix-based applications, virtual hard disk booting, VDI, MDTS, etc.
If you don't want any of these go for Home Premium.
PS> Enterprise is the equivalent of Ultimate, but it is only available to Companies with Volume Licensing agreements.