I built a pc two years ago and its been a terrible experience. Mostly because of the freezing and lock-ups in games. So this time i would like some advice in the compatibility of the part so i won't run into any problems.
CPU Cooler: Corsair H60
Motherboard: ASRock Z68 Extreme3 Gen3 LGA 1155
GPU:SAPPHIRE Radeon HD 6850 1GB
Memory (RAM): G.SKILL Ripjaws Series 8GB (2 x 4GB) DDR3 1600
HDD: 1TB Seagate Barracuda
Drive: Asus 24x
PSU: Corsair TX750 V2 750W
Case: Thermaltake V9 Black Edition
The Z68 may not be compatible with the 3570k out of the box. The Z68 was made first and thus it would need a BIOS made after the 3570k to get it to work. If the one you get has a BIOS older than that, it won't work.
If you want to be on the safe side, stick with a Z77 instead of Z68. Those are guaranteed to be compatible out of the box.
Otherwise, everything looks OK. I would skip the Thermaltake case in favor of a Cooler Master HAF series case, though.
Also, the Hyper 212 will be a whole lot easier to setup than the H60 and it will perform better too.