This is OCUK forum, so i use their pricing. I can get a second hand intel rig for a lot less than the above, means nothing however.
You're totally loading the prices in your favour. Just like you're loading benchmarks in your favour. I don't know if you're deliberately doing that, or, know very little about hardware. But any way, here is an 4+1board with the 8320. I won't bother with cooler as you'd need the same one. For example you've picked the GD80 which is MSI's most expensive 990 board. So look, it's not hard to turn it around.
I can get a Asrock 990FX Extreme 3 (good for 4.2ghz) and a 8320 for £183.
I can get a 4670k CPU for £173.99.