My only gripe with the hardware you selected is that I dont trust MSI Brand. Had one too many issues with them over the years. I'd go with Gigabtye, ASUS, or another trusted brand for Motherboard and Video Card.
As far as CPU and GPU go, it should be plenty and its a good pair up to have that 8-core CPU with a strong video card like that.
Power supply though I have some concerns about at 450 watts. I have a system with the AMD FX 8350 4.0Ghz and when gaming and my system itself connected through a Kil-a-Watt power draw monitoring device, I have seen it pull well over 400 watts before into the 550 watt range. My system has a Corsair CX 600 power supply. Video Card I had in mine was a GeForce GTX 260 Superclocked as seen here
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130372 ... I say had because I need to install the new video card to it when i get some time and then move this older card to my older computer. Newegg specs suggest 500 watt minimum power supply with the card I have listed, but thats not with a power hungry CPU like the 8-core, and the 8-core 125W TDP CPU on top of that causes it to idle around 280 watts with cool-n Quiet enabled to underclock the CPU when nothing is going on, but in serious gaming it pulls heavy wattage quickly and the 450 watt I feel is too weak an you should get a 600 watt minimum like I have in my system for that hardware combination.
The 8320 is a powerful CPU, but I had to have the maximum processing power available from AMD at the time that was in my price range. I got my FX8350 for $139.99 on a newegg special deal. Pic below of me stress testing my new system which was a christmas present upgrade to self.
Only problem I had with my build was that my Crucial Ballistix 8GB DDR3 1600 stick died on the 3rd day of heavy gaming at normal voltage settings and no overclocks. They were great though in getting me a quick replacement. Until that RAM stick was returned with a healthy new stick I temporarily ran this system on 2GB DDR3 1333. The new RAM stick has been healthy since.
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