I have Home Premium too. But I cant say if you'd need any of those things that Proffesional offers, so its up to you.
All I can say is that I've had zero problems since I installed. My PC is a gaming machine, so thats basicly all I've been doing with it.
But I think I need to mention that Windows 7 takes up nearly a gigabyte of memory just running. But you didnt mention if you're already running Vista or just XP, so I cant tell you whether or not you'd be better off with or without 7.