First Build Ever (any suggestions are welcome)

No; it is not. Some people don't like the idea of overclocking and I will respect that. You can also opt for a cheaper FX CPU route from AMD like the FX-8350. It has 8 cores, which can be very useful if you are a heavy multi-tasker and in multi-monitor setup. The i5 is still a stronger chip for gaming, but don't rule out the FX-8350. It is still a very good CPU for gaming.



Yes; you will want an aftermarket CPU cooler. The stock one will not handle overclocking. You can swap out the stock CPU cooler with an aftermarket one at any point in time. Just make sure you clean the thermal compound off the CPU with 99% Isopropyl alcohol and a lint-free cloth. You can use coffee filters as lint-free cloth. You will have to re-apply thermal paste after you clean it thoroughly. 620W is more than sufficient for a single HD 7950 and with plenty of room to overclock. So only upgrade if you plan to run multi-GPUs. Again, you can swap out the PSU so there's no rush. But it's always best to have it at hand so you don't have to waste more money for the upgrade later. More importantly, play to your budget now and worry about the future later. Your plans may change in the future.



8GB is more than enough. Most games won't use up the full 8GB. So you will have room to have other apps running. And should it use up more, you do have swap, so while other apps will be slower to re-load, it's not like it'll matter because you're likely playing a game so your attention isn't on your other apps. Once you exit the game, RAM will cleared for the game and the system will transfer swap back to RAM. But any other apps will never fill up 8GB. But there's nothing wrong aiming for 16GB. I personally run 2x4GB (8GB total) and have not had issues.



The BitFenix Prodigy does have a limit to how big of a PSU will fit into its case. Unlike most towers were the PSU slot is freely open and so it can be as big as it wants, the BitFenix Prodigy has a partially enclosed wall so if your PSU is too wide, it won't fit because there is a wall blocking it. As long as your PSU is within its limits, you will be perfectly fine.



Definitely consider FX-8350 + Asus M5A99X EVO R2.0. I would also up the SSD to 120GB. 64GB is cutting it close unless you plan to run Linux. Windows take up a lot of space.



Depends how much you sell it for. Look up pricing on what the component is at that point and then aim for a percentage lower because it is used. Also, overclocked components do have their lifespan decreased, so I would factor that in as well.

I hope this helps.