Possible gang System

Hi I was wondering if anyone had suggestions.
 I am considering the system outlined below. I am a gamer -for example the first thing I am going to do is load Dragon Age Inquisition- to give you an idea of use.
 The last 4 computers I have had are AMD, and I have had very good luck with AMD. I am pretty decided on my choice of GPU, CPU and motherboard. However, I am not sure about some of the other things.
 Is that power supply ok?
 Is it necessary to upgrade the thermal compound ? And if so to what? There are a lot of choices There!
 The integrated connectivity- do I need to upgrade? Or will the motherboard work ok for this?
 
 I am not terribly Knowledgeable  about hardware except for googled reviews and some past experience. And to be honest I am also on a budget & trying to get the best game system for the  buck. I want to make sure this system will work and doesn't have obvious flaws before I place the order.
 Thank you.
 
 
 
COOLER MASTER Elite 431 Plus (RC-431P-KWN2) Black Mid-Tower Case w/ Window, ATX, No PSU, Steel/Plastic

• HEC Orion HP585DB 585W Power Supply, 24-pin ATX12V, 1x 6-pin PCIe, Retail
• MSI 970A-G43, AM3+, AMD® 970, DDR3-2133 (O.C) 32GB /4, PCIe x16, SATA 6 Gb/s RAID 5 /6, USB 3.0 /2, HDA, GbLAN, ATX, Retail
• AMD FX-6300 Six-Core 3.5 - 4.1GHz, AM3+, 8MB L3 cache, DDR3-1866, 95W, 32nm, Retail
• MUSHKIN 8GB (2 x 4GB) Radioactive PC3-12800 DDR3 1600MHz CL9 (9-9-9-24) 1.5V SDRAM DIMM, Non-ECC
• SEAGATE 1TB Barracuda®, SATA 6 Gb/s, 7200 RPM, 64MB cache
• LITE-ON iHAS124-14 Black 24x DVD±RW Dual-Layer Burner, SATA, OEM
• XFX Radeon™ R9 280X 850-1000MHz, 3GB GDDR5 6000MHz, PCIe x16 CrossFire, 2x mini-DP + HDMI + DVI, Retail
• Integrated Audio Controller (Choose upgrade)
• MICROSOFT Windows 8.1 64-bit Edition, OEM w/ Media