Jinn.. ok so it's $200 less than the Apple right? What about support issues? You have to weigh this factor in as well. When it comes to gaming all you have to do is hit a keystroke and parallel over to Windoze and play your games. I'm not a gamer at all so I'm not familiar with what goes on with those machines. The reason the dell had a smaller MB video is because I didn't see an option to include a 256.. which means even if there was.. let's be honest, the Dell price would still go up. I'll look around and come up with more comparison's if I get the time. Also, sure you can always build a custom machine to out perform any manufacted machine.. but with the Mac Pro you now have PnP HDD bays to give you up to 3TB of storage for under $1000. That's pretty nice. This really comes down to "whatever blows your skirt". The mac just happens to blow mine.
Cyn: I'm not a fan of FCP for finishing either. That's what I use Nitris for. I do however know about working with the mac and windows versions of Avid and have also worked on some Discreet systems. In my experience and a colleque who is now a team production leader for discovery channel, will take the apple based systems over the windows based systems any day. They just work better.