#Build Help Help selecting a budget build

Hi I'm building my first pc in about ten years and I need some advice. My budget is around $300-400, and I was wondering which of the builds I found were the best in reddit's much more informed opinion.

edit: building it soon, not ten years from now. Thanks for catching it u/lanolaven!

Here are the sites: http://www.toptengamer.com/top-300-gaming-pc-build/

and

http://lifehacker.com/5840963/the-best-pcs-you-can-build-for-600-and-1200

and

http://www.forbes.com/sites/jasonevangelho/2015/02/07/build-a-compact-1080p-gaming-pc-for-400-benchmarks-included/#69eb75562204

Thanks so much! To me they all look good but I can't tell which is best. I'm trying to build a budget gaming pc that can run League, Hearthstone, Guildwars 2, and stuff from my steam library on a decent setting. I may also use it for streaming from time to time if it could handle that. Thanks again!