First of all, I have no idea why anyone would say that the AMD soultion hasa longer upgrade path. That's just rediculous. That 845PE board will probably go well beyond 4.0GHz with the option of Hyperthreading on newer chips. The future of Barton is questionable at best, since most performance users will, in theory, going over to hammer as opposed to barton. You're almost gaurenteed being able to throw a 1MB L2 cache Prescott into the Intel board in the future.
MTAX also said he'll be doing a fair amount of video/graphics editing, which is well suited to an Intel platform, espicially if you're using SSE ehanced apps.
And no matter what anyone claims, the average P4 is a better overclocker than the average XP right now, hands down. The OC is easier, and possible with the retail heatsink.
I don't care what you buy, it's your choice, but i recommend some research into what specific apps you'll be using and how they perform on each platform before jumping on one bandwagon. I personally think the Intel platform has a lot of advantages over the AMD platform right now, but that doesn't matter, it's your choice, whatever you think serves your purposes better is right for you.
-kramer