I know you have said you don’t want an integrated unit (last year I too was looking for a seperate pre pro), but something like a Denon X3700 would fit your needs nicely. The platform is rock solid, Audyssey works well, never had any HDMI issues at all, measure better than pre pros costing 2-3 times more. If you can get by without balanced connections (no ground loop issues, etc) it makes sense. With the brands/models crossed off you list there isn’t much left to choose from! It would be nice to have a lyngdorf mp50 or mp60 tested. I used a TDAI 3400 for a bit and roomperfect is nice. Like you though, not sure if it is worth their premium price or not (and they haven’t been bench tested here yet). Have fun with your search.