To pick apart all of your lame arguments trying to cut down my LEGITIMATE research on the XPS, but I have work to do. So I'll just say this:
My research was based on going to the Dell EPP site. I configured the machine to match, as best as possible, my MacBook. It didn't make it. Never will, as long as Vista is on it.
I bought my MacBook at the Apple store, (Discounts can be had there) and bought my RAM from Newegg. It was Crucial, which is better than most OEM (unless they use Micron).
I work in IT. I make a very good living doing so. I support PCs, own PCs, have built many, many PCs over the years, and now own a MacBook. As someone who has stood in the same place you're standing now, looking at the situation with the same myopic view, I can unequivocally state that, of all the computers at my disposal, including multiple Windows XP, Linux, and Windows 7 computers, both physical and virtual, when I go home at night I use my Mac. Why? Because it just works better.
As far as the statement that Vista is more stable than Leopard, PULLEEEASSE! Clean the sand out of your ears when you pull your head out of the ground. Your talking to someone who's extensively used every operating system MS has released since DOS 5. Vista is crap. You either know that, and are living in denial, or don't know it, and are too dumb to debate the topic. Ask yourself this: If Vista is all that and a bag of chips, why is MS rushing to get Windows 7 to market less than two years after it's release, when they let XP go for 6 years? It's a disaster. They know it. I know it. You should either know it or get a Mac, because not knowing it makes you too naive to navigate in the dangerous jungle that is the Windows OS.
As far as what this commercial was meant to do, it was MS taking the only road they had. "We know we can't compete on quality, so we'll talk about price."
Oh, just an FYI: When I bought my Mac I was specifically looking at the price vs. the quality of the build. And I didn't want a 15" screen. I don't need to be cool, and I was perfectly willing to replace my old, broken Compaq Presario laptop with a Dell, had it made sense. But it didn't. I have configured, worked on, repaired and built enough computers over the years to know that $600 laptops are an extreme waste of money. Write that model number down. Try to find it on HP's or Best Buy's websites in 6 months. Try to buy parts for it in a year and a half. Not generic parts, like memory and hard drives. Proprietary stuff.
I'll continue to run Windows PCs. But now that XP is gone, until 7 ships I won't buy anything that runs Windows. And I may just put 7 on my VM machine, and call it a day.