It's $80 more for Ultimate. Home Premium can offer pretty much anything that a home user or gamer would need, as they usually don't spend too much time tinkering with the OS.Most definitely worth getting Ultimate. I have Premium too, and I didn't have it on the computer long before I yanked it and put Ultimate on it.
Sooner or later you'll come to the realization that Ultimate is what *everyone* wants...just not everyone is willing to pay for it. For the few extra bucks, don't be a dumbass like them. lol