If you aren't up for making your own screen then Focupix makes a pretty nice product for the money. I don't love them, but at that price, I do. (hope that makes sense)
At any price, in fixed screens, Carada is one of my favorites. Their Criterion screens in Brilliant White are by far my favorite screen on the market. Their frame build quality is outstanding, and their product just works nicely every time.
Building your own screen with good material, such as the Seymour screen is also a good way to go, but I rarely see DIY screens which are built to a very high standard, and if you ever need to move it, you will be in trouble.