In my experience, separates will usually prevail b/c they're further up the food chain then most integrateds and are made from better parts and engineering. Having said that, the latest few generations of dual mono integrates are getting really close. The one box, fewer cables can be very appealing and deliver superior bang for the buck.
I own a Hegel H590 and did an inhouse side by side of the H600 vs my unit. The H600 is just a bit better and might give your current rig a run for the money.
If you could reach a little higher the Gryphon Diablo integrated that just came out is supposed to be on another level and would be worth a listen. Good luck and cheers.