A few thoughts:
Proc: If you do not intend to OC then go with the 2400 to save a few pennies (though the 2500K is hardly and expensive CPU)
Mobo: While the board you picked seems pretty good, you can go much cheaper. You will get the same raw performance from your parts no matter what chip-set you use. The chipset is for the feature set, and you should buy a chipset based on the features you would use. In this case the z68 gives you access to the onboard GPU features (like quick sink) while having an aftermarket CPU. It also lets you do SSD cashing which would let you use an SSD and a HDD as a single drive (it will store all data on the HDD, and move frequently used files to the SSD for a massive speed increase. Perfect for small affordable SSDs that cant fit everything). If you do not intend to use either of these features you can save an easy $50 on a cheaper P67 mobo without any performance hit. Even with z68 you can get quality for cheaper. Personally I just ordered the ASRock Extreme 3 Gen3 board as that will suit my needs:
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157271&Tpk=extreme3%20gen3
Ram: Good ram, but again, if not OCing there is little performance difference between DDR 1333 and DDR 1600. But if you are OCing then the 1600 will let you go further.
Case: Nice
Cooler: Similar to the Hyper 212, and the 212 tends to be cheaper.
HDD: Seriously, as others have said here, this is a huge monumental mistake. These are excellent 'cold storage' or 'bulk storage' drives, but they are quite slow and unfit for a system drive. Go buy a 500GB 7200RPM drive that has a good rating if you cannot afford an SSD. But be aware that without an SSD you will have a huge bottleneck in your drive system. With rebates you can get a decent sized SSD from Crucial or OCZ for the same price, and then get a bulk storage drive later after the flood waters subside and the HDD makers recover from their current issues (2TB drives were only $80 a month ago, and they will be again some point next year)
GPU: 570 is an excellent card! I bought a stock 570 card Friday and cannot wait for it to arrive, and the OC version is even better. However, if I was not tied to nVidia (need CUDA for Adobe Premere) I would have gotten the AMD equivalent as they are more power friendly. Also, for gaming the 560ti is soon going to have a refresh which will make it similar in performance to the 570, but at a lower price point. (again, I am tied to the 570 for adobe support otherwise I would have waited, or gone AMD)
PSU: While 850W is not exactly overkill for 2 570's, you would do just fine with a 750W for this type of build. Still, the 850W will give plenty of space for tons of HDDs/SSDs, add on cards, etc. But a 750W would be cheaper, and still give room for a decent OC, 2 570s, 2-3HDDs, and a mess of Ram.
OS: I am kicking myself for buying home premium. I am getting ready to do a home server, and the networking options in 7 Pro or Ultimate would be nice (cannot do a domain on 7home). But home premium is fine if you are not doing much networking. Be sure to go with 64bit. Many have purchased 32bit on accident lol.
ODD: It may just be me, but I find that optical drives wear out quick when you use them on a regular basis. I do the occasional video project, and have a DVD duplicator, and drives simply die no matter the brand, and no matter the expense. I have had better luck with dirt cheap Lite-On drives than I have had with anything else. Not saying you will have the same problem, and perhaps with occasional use this is not such a problem, but $180 seems like a lot of money for the 'privilege' of burning on overpriced BD media.
Wireless: Not familiar with that brand, but wireless N seems much less picky than wireless G was as far as quality is concerned. Just keep your cables bundled away from the antennas if you are having any signal issues.
All-in-all not a bad first build! Looks like you did your homework! The only real mistake is the HDD, everything else is just food for thought.
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