Looks like a solid build, impressive that you found a HD7970 for 274.99, that's about 100$ off of their normal price. I also like your choice in that case. The 200R is a simple, clean, and elegant case. Nice to work inside too. Overall, it should be a great rig for a couple years. Hope this helps, and happy building!
Yes you just remove and replace. If you get an 8320, upgrading to an 8350 is a waste. There will be little performance difference. Not noticeable in gaming at all. Don't worry about a CPU cooler now. You can always switch it out later.