I ran into LifusInterruptus before I could get into it, but I think I was on the same level as you when I went Sony Vegas. That was awhile ago but they've been good about keeping updated and etc.
I wish I'd had the time to spend really using it and getting some stuff produced. I've let my stepson try it, and he figured lots of tricks out really quickly.
Beyond it, and a few others like it, you're looking at stuff that goes beyond the off-the-shelf Costco computer!