Nothing wrong with anything you picked. You could tighten things up a bit in a couple areas.
Gigabyte HD 3450 video card $42 Plenty of GPU for the tasks you'll use the computer for.
Corsair 450VX power supply $75 (plus $10 rebate) Lots of extra power even if you stick with the 8800GT video card.
What were your thoughts on the LITE ON DH-16D2P EIDE DVD as opposed to another SATA optical drive?
Plan on using the 2nd optical drive for disk to disk burning? You can get better performance using the hard drive as your source for DVD burning.
You can extract the ISO image of a CD/DVD, even create an ISO image of files going to a CD/DVD, to your hard disk and then burn the ISO image to a disk. The software to do that is even free - ImgBurn
I would look into getting a good CPU cooler, Zalman 9700 or something like that. This will give you better temps when you want to overclock. I was underwhelmed by the performance of the Q6600, it really starts to become impressive when you're heading towards 3GHz. You may never want to overclock but still it's worth investing in a better cooler anyway.
I agree that you don't need the 8800GT for what you will be doing, go for a cheap nVidia card with dual DVI. I think 500-600W would be enough for your system so if you could get a better quality PSU for the same price as the one you chose that would be a plus.