First time building a full rig. Need help/opinions.

So this will be my first time building a computer from scratch.
I've purchased and installed parts such as mobos, hds, ram, etc but not a full build.
I've put together a list of parts that I've taken from other threads with a budget of around $800.
I just want some opinions/advice on what I have so far and also if they're all compatible with each other.

Antec Three Hundred Illusion Black Steel ATX Mid Tower Computer Case

SAPPHIRE 100315L Radeon HD 6850 1GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card with Eyefinity

RAIDMAX HYBRID 2 RX-630SS 630W ATX12V V2.2/ EPS12V SLI Ready CrossFire Ready Modular Modular LED Power Supply

G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-8GBXL

ASRock Z68 Extreme3 Gen3 LGA 1155 Intel Z68 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard

Intel Core i5-2400 Sandy Bridge 3.1GHz (3.4GHz Turbo Boost) LGA 1155 95W Quad-Core Desktop Processor Intel HD Graphics 2000 BX80623I52400

Aside from a Disk drive and a HD which I already have am I missing a part that doesn't come with one of these items?
Thanks you if you've taken the time to read this!
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More about first time building full help opinions
  1. Everything looks good , the only thing I would do different is the power supply. I would go with a better brand , like Antec , sometimes if you egt cought up in trying to get everything cheap it comes back to bite you. The power supply is one component that you want to be very reliable and efficient.

    Antec High Current Gamer Series HCG-620 620W ATX12V v2.3 / EPS12V v2.91 SLI Ready CrossFire Ready 80 PLUS BRONZE Certified Active PFC Power Supply

    There are other brands as well , Corsair , Seasonic , Enermax.

    SeaSonic S12II 620 Bronze 620W ATX12V V2.3 / EPS 12V V2.91 80 PLUS BRONZE Certified Active PFC Power Supply

    CORSAIR Enthusiast Series TX650 V2 650W ATX12V v2.31/ EPS12V v2.92 80 PLUS BRONZE Certified Active PFC High Performance Power Supply

    A good thing to do is to look through the feedback from these psu's and compare which has the better feedback along with price. When I look at the feedback section in Newegg I group the 5 star and 4 star together and the 3, 2 and 1 together and see what component has the better feedback.
  2. For $30 difference, it's hard to resist saying "get the 2500k"

    If there is one thing I could convince you to change, it would be the PSU.....XFX Core Edition is a 9.5 jonnuguru performance rated PSU for $60 after MIR.

    I'm concerned about the short MoBo warranty but budget leaves little options.

    If ya plan on OPC, and who doesn't w/ SB, a decent cooler (Hyper 212) will cost ya $25
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