I ordered a Dell XPS 8300 after spending 5 years on a Mac. I got a better video and sound card plus a better screen. BUT I got Windows 7 Home Premium and 8GB memory. Is this version of Win 7 okay or should I upgrade? And is 8gb okay? It's an i7. My Mac just has 3gb memory so I'm lost comparing Apples to oranges (LOL so to speak). Thanks.