Looks like a well balanced system.
IMHO, the best bang for the buck for an improvement after the room treatment is to upgrade the preamp. Changing speakers will bring more change, but at higher cost.
However, you might want to have a long term plan to upgrade the whole system (which will cost at least 20K for a new system and 10K for used).
For example of a used system, I have Plinius SA102 (2K), Audible Illusions M3B (2K), Oppo 105 (1K), and Gershman Avant Garde (6K). Such system will definitely sound superior to your current system.
My 2 cents.
IMHO, the best bang for the buck for an improvement after the room treatment is to upgrade the preamp. Changing speakers will bring more change, but at higher cost.
However, you might want to have a long term plan to upgrade the whole system (which will cost at least 20K for a new system and 10K for used).
For example of a used system, I have Plinius SA102 (2K), Audible Illusions M3B (2K), Oppo 105 (1K), and Gershman Avant Garde (6K). Such system will definitely sound superior to your current system.
My 2 cents.