Dwarf

I suggest that you get the Ultimate version. It will do everything that the Home Premium edition can, plus you will have the additional functions available should you need them. Retail versions, both full and upgrade (you can save money by opting for the upgrade version), of the disks are available with SP1 pre-integrated, so you should have no worries about that (I expect that disks with SP2 will be available in much the same way when SP2 is finalised).