What are your thought on this gaming pc?

Better to spend a little bit more on the graphics card and get a GTX 760. If you want to strictly stay with AMD graphics cards, get the R9 270X which is more worth getting.

As for HDD, get the black one (apparently only those ones are good by WD). The rest is fine.

The r9 270 seems good
http://www.tomshardware.com/reviews/radeon-r9-270-review-benchmarks,3669-4.html

read this too
http://www.tomshardware.com/reviews/radeon-r9-270-review-benchmarks,3669-10.html

I don't know if the 8320 is worth it
http://anandtech.com/bench/product/698?vs=699
the fx 6300 is 40 dollars cheaper and seems to offer about the same performance

you could get the fx 6300 and spend the 40 dollars on an even better gpu

make sure your power supply is at least "80 PLUS BRONZE Certified"

http://www.newegg.com/...IsNodeId=1

you could read some of the reviews of the 6300 and see what motherboards those people are using
http://www.newegg.com/...6819113286

newegg, anandtech and toms are pretty good sites