So I own a PS4 but would really like to add a PC to use to access the huge library of indie games available as well as some of the "newer" GOG stuff such as the Witcher games. I know nothing about building a PC or the parts that one should covet so I figured some duders here could help. I am looking to balance functionality with price and ideally would like to spend less than my PS4 if at all possible, although that may not be.
If we are talking about current games the most graphic intensive stuff I would be looking at playing is in the Kerbal/Space Engineers range. I am not a huge graphics snob (I thought Bioshock: Infinite looked fine on 360) and wouldn't be too disappointed if I couldn't run the game on ultra high settings as long as its a playable framerate and at least looks decent (again 360 level graphics are fine for me). The only other things I would really be looking for are a small form factor case for easy portability/sliding next to a TV or entertainment center and HDMI out (which I imagine is basically standard at this point) so I don't have to buy a monitor. If the thing can stream that would be a plus although the processor and RAM required may make that difficult for my desired price point.
Any tips/suggestions would be appreciated.