VR Suggestion?

So hey guys! I want to buy a VR...

But I got some issues and because of these I don't really know which VR is now the one for me.
So these are the things I want to be able to do and what issues I have:
- I want to be able to use Games of Steam on my VR (vr games ofcoarse)
-My room isn't too big so the Oculus Rift doesn't really work since you have to place some sensors or something? (Not too sure)
-I also want to be able to make VR games in unity

Please help me out!