You're right, I missed the second GPU, but another GTX 560 is worth barely more than $200.
You made off like a fat cat? Man, Alienware makes money off of people like you who don't know they can make a better computer for a third, or even a quarter of the price. Why did you want a laptop, anyway, when it seems like your main purpose is gaming?
If you have the money to blow on it and it genuinely satisfies you, then cool, whatever. But don't act smug and cocky about it, which it seems like you are.
Oh btw, your new computer isn't going to be "twice as powerful." The only thing that would have a noticable effect would be your GPU's in SLI, which you would notice in games. 16GB of RAM is a lot and all, but I highly doubt for your purposes that your computer would even be using 4 at any given time, even with a bunch of programs open.