So difficult to choose! Need help for projector pack

Hi, I am planing to buy a projector and a screen for my living room. It will be used for 70% movie and 30% game, around white walls but mainly used in the night, about 3.7 throw distance, screen 90-100 inches. My budget is about 20k SEK,

I have been looking at forums and reviews, also asked help in hembiobutiken since it's the only shop in Stockholm with demos. I was recommended with two kind of packages, screen first or projector first. Which one is right? I was confused and have been struggling with choices.

• Option 1 is Optoma HD50 + Euroscreen Frame Vision Light ReAct 3.0, 12k+10k
• Option 2 is Epson EH-TW7200 + Grandview Velvet Cinema, 15k + 6k

HD50 seems to have a huge input lag so I am leaning towards option 2, but I don't know if I need such a good projector, and will there be a huge difference if I update the screen? 

I also find a second hand Euroscreen VLS React 2.1 costs 6k, should I buy that one?

Thanks for any tips and suggestions!