I would advise not getting any Silver Ticket screen with that projector. They (along with many other economy brands) use the phrase 4K/UHD "Ready".
I don't really understand what they are trying to claim, because their surfaces will not resolve a square 4K pixel due to the textured nature of those surfaces.
Will the image look good with your NX5 and a Silver Ticket Screen? Probably. Will it look as good as it would on a proper, textureless 4K surface? Absolutely not.
As expected, the price of a legit 4K screen is higher than that of a "ready" screen. The same holds true for projectors as well; you pay more for the higher resolution, contrast, etc.
Silver Ticket is only sold on Amazon (as far as I know) and has a tremendous amount of positive reviews there. They are also highly endorsed by many "Amazon Affiliate" sites such as WireCutter and others who make commissions on referring people to Amazon.
I have no doubt that there are many satisfied ST customers and on 1080p their product is totally appropriate. When you get to 4K however there is a very obvious difference in quality when going side by side with a textureless surface.
I just did a quick search on Amazon reviews for a ST screen with keyword "4k" and the first result echos what I just said about texture.
Here is a link with some more info on textured/textureless surfaces:
4K / UHD Projection Surfaces Explained