First off - welcome to HTS! :wave:
I am not sure if the room is finished or not, but with that much length, I would seriously consider do a front baffle wall and an AT screen as it really takes all the distraction of the speakers away from the visual experience.
How flexible is the mounting location for the projector? This will help trim the list a bit as some projectors may not be able to give you enough FL for that size screen at your distance.
Next, what is more important - audio or visual? This will help to determine how to allocate your budget.
I am sure there is more I am missing, but this should help get us started.