What type of projector screen should I get?

I'm new to the projector world, and I could use some help choosing a projector screen:

Projector: Epson HC8350 Powerlite Home Cinema 1080p projector

Brightness: 2000 lumens

Contrast: 50,000:1

Desired screen size: 105" diag at 16:9 (51.5"H x 91.5"W) - preferably fixed wall-mounted (not one that pulls up or down)

The screen will be next to a floor-ceiling window, which I consider to be "medium" ambient light during the day with blinds closed. I've used the projector on the bare wall, which is somewhat glossy, and the image is more than bright enough at that size even during the day but suffers from hotspotting and the texture of the wall.

What I need help figuring out is what color (grey, white), what finish (matte, glass-bead), what gain (to defeat light pollution but not have a hotspot), and what brand is best for me (and what brands to avoid). I'd like to spend around $500 if possible, and a reconditioned screen is ok as long as the screen itself is undamaged.

Any help is greatly appreciated!!