I am not sure but do you have the Bulldozer CPU already? as to be honest I would have chosen the Intel 2500K over the FX-8120,as overall the 2500k is the best gaming CPU, and outperforms the FX in rendering. If you haver already got the chip then can I suggest this mobo.Asus SABERTOOTH 990FX. A little over budget or this one Asus M5A99X EVO which is in budget, or a Gigabyte GA-990FXA-UD3 again a tad over budget. These of course are personal choices if I was going the AM+ 3 route. I have gone the Z86 and I5 2500k with a single GTX 670.
Your RAM link does not work so you will need to check compatibility.
You might want to add a small (60-64GB) SSD in the build for your OS and programs,everything else,games music films etc can go on the 2TD HDD.
If you are concerned about the stock cooler buying an after-maket one will not necessarily cost much.