If you can accomodate a "fixed" screen then you can experiment

Either the wall (provided it's very flat & surface defect free) or a "frame" attached to the wall with blackout lining etc..
Everyone raves about a 50/50 mix of Icestorm 5/6, but IMO it zaps too much life from the picture (& I've seen it with an AE100).
Many (inc. myself) have windows etc.. to deal with, so a manual/electric screen is the only option.
Making your own screen is also very cost effective (£30ish) where as manual & electric screens run from £150 to well over £1000
Loads of info available here but will require some browsing & use of the search facility.
Best of luck