Laptop or Desktop? Help me decide plz!

I was all set to build my new energy efficient budget desktop but then I came across this laptop for a Black Friday ad
http://www.bestbuy.com/site/olspag [...] =10&loc=05
It's advertised at $499.99 which puts it right near my planned $400 desktop build. Here's my specs for the desktop:

E5200 with g31 mobo
Radeon 4670
4 gigs 4-4-4-12 ddr2 800mhz
Antec Sonota III w/500 psu
160 gig hd
dvd burner

I selected the parts based on my desire to have a low energy, low cost, powerhouse. This setup should be more than enough for the games I want to play later on (SC2/Diablo3/CS:S/TF2) and I've guestimated that the power output for the entire system at around 50-100watts. With my 19 inch lcd, the power consumption should go up a bit (I have no idea how much lcd's consume and I have no name generic brand)

From a performance standpoint, how do you think the laptop would fare if it went head to head with my desktop build? Obviously, I expect the desktop to be more powerful for games due to the graphics card but I want to know if that laptop will have enough in it to run SC2/D3/CS:S/TF2. These are probably going to be the most cpu/graphics intensive things I'll be doing so if it can run those, I'll be happy.

Your gonna have to spend atleast a grand to run these games at a smooth FPS on a laptop.

+1 get the desktop

possibly with a custom build you might get a laptop with a decent gfx card for less than a grand. But from my experience most of the larger manufacturers like DELL of HP dont sell lptops with much better than a really bog standard card, and dedicated gaming manufacturers like sager of alienware (Dell) charge big bucks