upgrade what

Hello

My system sounds pretty good but can be a little bright, forward sounding and sometimes lacks really good instrument separation. I have decent Morror cables and AudioQuest power cords. Just wondering which component would you be looking at to upgrade? 1) Denon 1700NE CD/SACD Player; 2) Rogue "Dark" Magnum lll Integrated Amp 3) Focal Aria 948 Speakers; 4) Two SVS SV2000 Pro Subs. I was thinking of better speakers. Maybe book shelves since I have the 2 subs. Thanks a lot.

Bill