This build is a budget (<$300) build that I been debating for awhile. Originally, I was thinking an AMD FX 6300 build, but decided with this instead. I started looking for the really good deals on good parts, until I got these build. I wanted to build a HTPC/Steam box to play games, stream movies, surf the web, etc... on my entertainment center downstairs (This is using a UN55D8000 and a pretty nice 2.1 surround sound). This is also will be effectively replacing my Xbox 360 for any gaming on the entertainment center. I have a $15 dollar Xbox 360 wireless adapter for all my controllers. I also got a $7 adapter for PS2 controllers.
For the 3DMark tests, I just used Firestrike 4K, Extreme, and Normal.
CPU: What can I say that hasn't already been said about the G3258. It is a $70 Overclock-able CPU. This can supposedly rival an i3 and FX 6300 when overclocked.
CPU Cooler: After searching for something in that $30 dollar range, I kinda of just said screw it and went with the Noctua U9B. It runs great. It is Pretty darn quiet. Originally I was planning on just using the stock cooler. But the stock cooler was just awful (it was running at 90C sometimes in BIOS, I am guessing lemon or something). So I upgraded and upgraded pretty well if I may say so. It handles temperatures pretty well (peaking at 66 C after 25 minutes of testing) and I can only slightly hear it (when I am near it), but that won't matter when everything is turned on and it is in its place.
MOBO: I was really excited when I learned you can overclock on this board any Intel processor. Since this will be my first attempt at overclocking, so I am glad they limit the voltage to 1.2 V.
RAM: great deal on RAM. I got this since it is rated very well and it was under $50. Plus its CL9 DDR3-1600.
Storage: This is an old Seagate Barracuda 1TB that I got for $30 bucks over a year ago. Huzzah for reusing parts.
GPU: I am super excited to try this card out. My friend gave it to me when he upgraded to a GTX 980. I already have a GTX 970 in my main rig. I plan to overclock this as well. I may just be able to play games on high and maybe even ultra settings.
Case: This case came with a combo. Right after I got the combo, I worried about it. Since, it would have difficulty with a GTX 970 (I put mine in there. it was a pretty tight fit) and I can't get a Hyper 212+ or EVO in there.
PSU: This is probably my weakest item of these build (though still not a bad piece). I couldn't find any better deals on better PSU. $35 bucks for a 600W Semi-Modular Bronze PSU is a good deal. Plus I sold my old Corsair TX 750W non-modular PSU for $30. This should be more than enough to overclock everything with tons of room to spare.