Man, I own Both Macs and PCs. I have for MANY years.
For games, PCs are the way to go... (Although bootcamp is changing that...)
For my Family PC... Surfing Web, Email, Kids Games, ITunes, Syncing with WINDOWS MOBILE phones... We use an iMac... (Yes, I can more easily sync my Windows Mobile phone with a MAC than I can with Vista (Or XP Really!)
For Video Editing of our home movies and getting them to a DVD, IT IS A MAC ALL THE WAY.
I have tried EVERYTHING on a PC, and continue to try every so often, and there is NOTHING that can match iMovie and iDVD on the MAC.
I get STUNNING results with my DVDs EVERY TIME.
I wish you luck on the PC... For the video editing, the PC is getting somewhat better... Heck, the Free Windows Movie Maker is pretty good... But when you want to get that movie to a DVD, there is NOTHING that can match iDVD.
Truely, you are missing the point.
If you just want to puke your home movie onto a DVD, then sure the PC can do it...
But, if you want to EASILY make a DVD of your home movies that contains ABSOLUTELY BEAUTIFUL menus, slideshows, and high quailty movies, then you need a Mac with iDVD.
Like I said, I have tried EVERYTHING on the PC... Nothing comes close to iDVD. Add in how smoothly iMovie, iTumes, and iPhoto integrate into iDVD, and you have the most amazing $79 (Free with a Mac) suite of products for home movie production.
Can a quad PC render a movie quicker? Sure. Can it puke it onto a DVD? Sure.
But I bet you that if you take your finsihed product, and compare it to one done on a Mac, you will wish that you went with a Mac.
On the plus side, you do have a kick butt gaming machine, and there is something to be said for that. (I am a gamer too...)