If you live near a Microcenter store, you can pick up the same processor for $160 plus tax. When I said save money, I was going to recommend that you get an H81 or B85 motherboard because it'd cost less and you wouldn't be overclocking anyway. Something like the Gigabyte GA-B85M-DS3H-A, it's as cheap as $51 after $10 rebate elsewhere and it should meet your needs just fine.
You could also reuse your existing 4GB of RAM with the new motherboard and just add another 4GB for around $20 and have 8GB total.
You can get cheap Windows keys from reddit. Here's my usual disclaimer:
Cheap Windows licenses can be bought from reddit's microsoftsoftwareswap for cheap, around $15 USD or less. Windows 10 licenses are also available for a bit more. These are most likely legitimate keys that are resold from educational programs like Technet or MSDNAA/Dreamspark. However, you are dealing with a person instead of a retailer, and informal Windows keys sales are not approved by Microsoft and probably breaking some licensing agreement, but it's not illegal. The risks involved are that the person could be selling you a fake or used key, or that Microsoft may refuse to give you support and/or deactivate your license and refuse to reactivate it. That's not very likely, usually it only happens if the seller and their list of sold keys was caught. We've had people here using those keys without issues for a long time and others who say Microsoft deactivated their key after several months. The 7/8/8.1 keys should be upgradeable to Windows 10, but confirm with the seller to be sure, of course.
