Back on to the topic, I researched this recently as for various reasons a screen wasn't fitting in the new room, neither my previous large pull down or a slightly smaller pop-up. Both one hunder pound or so screens. I'd also used (good) screen material as a permanent screen on the wall with a velvet border but couldn't get it totally flat and it wasn't ideal decoratively. A motorised tab-tension would have worked but I wasn't prepared to fork out.
I decided to take the universally accepted performance hit of painting the wall and have no border and started to investigate. Some US guys were mixing whites with various amounts of gloss and metallics and reckoning they could get better results than very expensive screens, so it seemed good. The paints weren't available, and I wasn't prepared to do loads of experimental mixing. I looked at the special paints but they were expensive and I wasn't convinced, and thought if I tried normal paint I could at least use it for other stuff if the picture was rubbish.
I finally decided to go for Farrow and Ball All White, which tends to have plenty of pigment and seemed the purest white around, (others tinted blue or pink slightly). I went for Modern Emulsion, (7% gloss and wipeable).
Anyway, I feel the picture is better than the screens were providing, and don't miss having a border. Thre colours seem better contained and more natural to me, and I think the picture is a little sharper. anyway I'm very pleased and don't intend to go back to a screen any time soon.
If you want to know more detail I posted on here after I'd done it, (I think it was titled Farrow and Ball All White).