Dedicated room

Hey guys, let's hear your thoughts! I am building a 1000 sq ft addition onto my house and it will incorporate a listenig room which will be 14'x22' with 9' ceiling height. Being 25 I don't have a vast history with acoustical patterns (nulls, reflection points, ect..) Anyone have some "sound" (ouch!) advice for room set up? My local dealers are idiots so let's hear from the real experts. YOU.