Need two parts that will fit with my build

I working on a new build but I want to replace two parts since I've been hearing from a lot of people that they aren't worth the cost or they arrive DOA. I'm pretty much dead set on this build other than the two parts which are the graphics card and the power supply. Money isn't an issue although I want to keep the price around the same range. Also I plan to over-clock this system when it shows it's age. Just tell me what you think and what I should get as a replacement. Thanks for the advice.
Here's my build

Motherboard-GIGABYTE GA-Z68X-UD4-B3 LGA 1155 Intel Z68 SATA 6Gb/s USB 3.0 ATX Intel Motherboard
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128494

CPU-Intel Core i5-2500K Sandy Bridge 3.3GHz (3.7GHz Turbo Boost) 4 x 256KB L2 Cache 6MB L3 Cache LGA 1155 95W Quad-Core Desktop Processor BX80623I52500K
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115072

Aftermarket CPU Fan-CORSAIR CWCH60 Hydro Series H60 High Performance Liquid CPU Cooler
http://www.newegg.com/Product/Product.aspx?Item=N82E16835181015&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-RSSDailyDeals-_-na-_-na&AID=10521304&PID=4176827&SID=1kze4vd6860h8

Memory-G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-8GBXL
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231428

Graphics Card-EVGA SuperClocked 012-P3-1573-KR GeForce GTX 570 HD w/Display-Port (Fermi) 1280MB 320-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130620&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-RSSDailyDeals-_-na-_-na&AID=10521304&PID=4176827&SID=1vla59jpdcyob

Harddrive-SAMSUNG Spinpoint F3 HD103SJ 1TB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive
http://www.newegg.com/Product/Product.aspx?Item=22-152-185&SortField=1&SummaryType=0&Pagesize=10&PurchaseMark=true&SelectedRating=5&VideoOnlyMark=False&VendorMark=&IsFeedbackTab=true&chkPurchaseMark=on&Keywords=%28keywords%29#scrollFullInfo

PC Case-COOLER MASTER Storm Sniper SGC-6000-KXN1-GP Black Steel, ABS Plastic, Mesh bezel ATX Mid Tower Computer Case
http://www.newegg.com/Product/Product.aspx?Item=N82E16811119194

Power Supply-CORSAIR Enthusiast Series TX850 V2 850W ATX12V v2.31/ EPS12V v2.92 80 PLUS BRONZE Certified Active PFC High Performance Power Supply
http://www.newegg.com/Product/Product.aspx?Item=17-139-022&SortField=1&SummaryType=0&Pagesize=10&PurchaseMark=&SelectedRating=1&VideoOnlyMark=False&VendorMark=&IsFeedbackTab=true&Keywords=%28keywords%29&Page=1#scrollFullInfo
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  1. I'd suggest a similarly priced big air to the water cooler. Sandy Bridge doesn't really need water cooling, and air is much less maintenance!

    this would work wonderfully:
    http://www.newegg.com/Product/Product.aspx?Item=N82E16835106150

    It's ranked #5 at Frostytech:
    http://www.frostytech.com/articleview.cfm?articleID=2523

    a Single 570 GPU can get by with a 620-650W PSU. It needs 36amps on the 12v rails for the entire system.
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817151096
    this has 48a across its 2 12a rails, more than plenty, and as good a quality psu as you will find anywhere.
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