http://pcpartpicker.com/p/vb8CsY
There are a ton of different options out there at the $800 price range, but here's a quick list I threw together. I went a little under $800 on paper so you'd hit that target before receiving mail-in rebates and after buying a Windows 10 Pro key for ~$30 from Kinguin. You can make a lot of adjustments to this blueprint to fit your needs, like omitting or opting for a smaller hard drive or getting a beefier GPU. Since you'd be making videos, though, you'd probably want a nice and roomy hard drive to record to and archive footage.