Per the diagram, I have a 66’x30’x9’ finished basement, with a HT 25’x15’x9’ room open to the rear to 40’ rec room. I used my existing equipment and added the Sony projector and wall/ceiling speakers. I wish to upgrade to accommodate a 7.2.4 4k/Atmos system. I live in the sticks, internet is limited and streaming is a joke! Media will be 4K Blu-rays/Blu-rays and sports/movies from DIRECTV. I have a 55” Plasma in the middle of the rec room for 80% of our watching. The 4 ceiling speakers for Atmos are not purchased/installed. I have been reading (FORUMS) and visiting our only HT store to acquire a working idea of my needs and cost. I plan to keep the DT 2002 front speaker system, they have 12” amp sups to balance my REL T1 subwoofer requirements. The Polk Audio side and rear speakers are space holders and up for replacement, the ceiling speakers are TBD. I cannot arrange all speakers at ear level, it does not meet my room setup. My budget is 10K, TBD based on cost of 4K projector, AVR 7.2.4, 4K Blu-ray and wall/ceiling speakers. I hope this is enough info to get me started on how to “skin the cat”. What issues is there with staying with my front & sub sound system? If Definitive Tech is my front system, do I stay with DT for all my speakers? I hear no sound from my rear speakers, they are in wall firing down. I have a 35" high counter behind the prime seat. I need to replace with a box speaker and swivel bar. Recommendations.