Building a Gaming PC

I'm a new up and coming streamer that streams many games on twitch.tv/theblakadder. 

Currently I stream from my laptop which can't run many games, that ones that it does are very laggy and drop frames.  I want a computer that I can run games on decently that way I can make my streamers happy and hopefully become better at streaming. 

The price range i'm shooting for is $300 to $1,000. All the parts will be put on a list for anyone to see or make suggestions to.

I'm thinking of dedicating a day to anyone that donates for a streamer/donater day. Your name in the title, and you'll be featured on the stream. 

Any help is appreciated and sincerely thankful to anyone that does donate!

If you have any questions message me at twitch.tv/theblakadder!