Note: Most of my suggestions are going to be for cost-saving purposes, the rig will run fine as-is, but a lot of it is overkill.
1. If you are only using this PC for gaming, the i7 2600k is overkill. The
i5 2500k is considerably cheaper ($87 cheaper to be precise) and will handle anything you throw at it.
2. 16GB is overkill for a gaming PC, if you're looking to save money you can bump that down to
this 8GB bundle and you'd be fine (and save $60).
3. Edit: Disregard number 3 if you've already read it. I'm going over my recommendations on the site you provided now and they don't sell the SSD I suggested as an alternate. They do sell the OCZ Vertex 3, which is what I'm using, but it isn't a big enough savings for me to recommend switching to it.
4. I don't know much about that case, but I don't see it recommended very often, maybe someone else could weigh in.
5. I went over the differences between
Home Premium and Ultimate using the
Windows 7 website, and I don't see enough of an improvement to recommend the $110 price increase. For a gaming PC,
Home Premium should do fine.
6. If you follow my earlier suggestions, you could use the money you save and bump the GTX 570 up to
a GTX 580 ($140 price difference), the 580 beats the 570 by a pretty good margin in
most benchmark tests.