I have a Dell i3 tower with a video card needed by the Pinnacle and Avid packages.
For the most part, I do simple cuts and tweaking for stock footage and the once in a while youtube package. I may try to upgrade to a 7 later this year around Christmas time depending on the deals.
My Pinnacle 15 works great on my i7 quad core for editing HD. No problems with it like you read about on forums on the web. The complainers are just using underpowered computers. Download to YouTube, make Blu-Ray discs, etc., no problem.