Welcome to SPCR. Overall - it's a pretty build. There are some components that I'd tweak for gaming.
- CPU: Very few games make use of hyperthreading. You could save $100 and get the i5-3570K and not see a difference. If you spend a lot of time encoding video or use other apps that make use of hyperthreading, then the i7 could be useful.
- Mobo: Are there specific features you like on the Pro version of the mobo? More features -> more power used by the mobo. You could drop down to the - V and still get Fan Xpert2 (allows you to set fan profile to turn off case fans at idle).
- GPU: There's also the MSI Twin Frozr GTX 670. Also, if there is one thing I replace on my builds over time, it's the video card. You should look at GTX670 vs GTX 660 Ti benchmarks to determine if the extra $100 is worth it for your gaming needs/resolution.
- SSD: I like the 840 Pro. Do you need 240GB? While there will be a little speed difference between the 120 and 240, you won't notice it.
- RAM: Unless you do a lot of photo or video editing, more than 8GB is just money spent.
- PSU: Your stressed load power will be <300W and probably 250W or less while gaming. If you overclock the CPU 20% without overvolting, then you raise the load another 16W max (0.2*77W). If you plan to overvolt the CPU, then it can go up significantly. Same thing with the GPU. Here's a couple of PSU suggestions:
- Seasonic G series SSR-550RM (~$90). Modular. 90+ Gold.
- Seasonic X series SS-550KM ($125). Modular. 90+ Gold. Can set the fan for semi-passive mode - only turns on >20% load.
- Kingwin LZP-550 (~$130). Modular. 90+ Platinum. Can set the fan for semi-passive mode - only turns on >20% load.
- Be Quiet! Dark Power Pro series is also nice.
- Cooler: If you don't plan to overvolt the CPU, then consider the Thermalright TRUE Spirit 120M.
If you plan to overvolt, then something beefier would be better...like the Thermalright HR-02 Macho
- Case fans: Start with what you get and see if it works for you. You can always add more / swap out fans later. Everyone has a different opinion on what is noisy/quiet. Best bet is to start with these quiet components and then modify as you need to for you personal preference.