Would I need a better CPU fan for overclocking? Also, I have no internet in my room. I've seen some prebuilt systems with like WiFi cards. I'm not sure what they are called, but I would need one of those so I could access the internet.
also change the ram into 2x4GB it will be cheaper than 4x2GB by about $6-$10 and gives you space if you want to upgrade to 16GB(don't recommend unless you do some heavy application stuff such as photoshop and video rendering)
since ASrock 75B only has 1x PCIe 3.0 slot and you will probably only use 1 GPU anyways
The total is a little bit over your budget - but this is also a conservative estimate; I didn't include any rebates (only instant discounts), so should any of them work, you'll be right at your budget (or lower, if you're lucky). If you haven't already, you could take advantage of ShopRunner's 30-day trial to get free 2-day shipping on all of the parts, as well. As for the computer itself: I chose the 3570k + Z77 motherboard because I figure you'd rather not replace that for as long as you can, so that's the option that will give you the most mileage in this budget. The ASRock Extreme4 also includes 2 PCIe 3.0 slots, so if you choose to Crossfire the 7850, then you'll have that option as well. You've got a highly reliable Seasonic-made power supply (it's re-branded and slightly reconfigured) putting out 600W - plenty for this build. The HAF912 is a veritably cool case (High Air-Flow 912) that's got plenty of room for more fans if you feel the need to get more, as well.