looks like a good build, but there are a few oddities:
the hard drive you list is a notebook harddrive; you'd probably want to get a desktop drive; better value for GB size (and it doesn't need an adapter).
The DVD drive is read-only; and you can't burn things with it. You might want to consider a DVD-RW burner; they are cheap these days.
The Case is a good brand; the computer I'm using now is built with a Cooler-Master branded case. Overall, looks good to me. But I'm far from an expert, I got lots of help on my build from several members here (Patio and Calum, to name two).
Now, ive checked some websites about games it would be able to run, and it easily passes the test for crysis and battlefield badlands 2 as well as DiRT, which as far as im aware, are the most demanding games in the world.
Definitely true, but I should relate something; there are some games that give those games a run for their money requirements/processing wise. One specific example I can think of is Duke Nukem 3d; not the same one that was released in 1996, mind you, but with 3-d model enhancements and a new polymer renderer with dynamic lighting and so forth. Of course that's more of a "skunkworks" type of project and not something I would measure against, but my point is that while the games you mentioned do have high requirements, they are probably far from the "most demanding in the world"
