Is the OP an acoustician specialized in small room
That is a GREAT question. The OP (as in moi) knew his limitations re: small room acoustics AND his budget. Thankfully I had the sense to get the acoustics right before blowing up my budget. There is some GREAT info available on the topic which I chose to avail myself of. (check page 2 here) and (chapters 4,5, and 10 here) This is a starting point and yes, I consulted with professional mixing stages, studio owners, the founder of Auro 3D, and installers of high end listening rooms and home theaters. I have had my measurements reviewed by professional acousticians. Maybe it was overkill but still a LOT cheaper than buying new gear.