Heh nerve wracking
When I do a build (even if its a laptop order) I do stupid amounts of research on every single little thing, even down to 20$ fans and the like. It usually takes me 2-3 weeks before I'm ready to buy anything
Anyhow good selection you should be very happy with that system.
However, I see an error in your selection, the hard drive you chose is a 2.5" mobile laptop type drive (free fall sensor is a giveaway) and your case doesn't seem to have any 2.5" drive bay slots (only 3.5"). You better buy a different one and cancel that one. I would suggest a bigger drive as well (200gb is tiny, heck my 16" laptop has 500gb).