I'm not up to speed on the HT lingo, what is an "AT" screen?

I'm looking at twisting a room to a true media center room so I would like to know what you end up with.

I had my mind set on a short throw projector. Have you looked at those? The research i've done is a few short trips to a BB magnolia center. I thought the short throw was better. Please steer me in the right direction if i'm off here as I need to land on something very soon.

Lots of speakers from many
manufactures...mostly Axiom