If you're editing video, 10 GB won't be nearly enough. I get by with 120 gig, but feature length projects are easier to work with if you get even more than that. 512 RAM is minimum unless you want to spend a lot of time rendering (REALLY tests your nerves if you're tweaking advanced effects and filters). If you're going to buy a finished package, I recommend you get one with a DVD burner.
Software-wise, Adobe Premiere Pro is the best video editor for PC if learning curve is a factor. AVID is actually pretty overrated. My personal favourite is Final Cut, but that's Mac only
