I’ve seen the raal ribbons described as “laid back” more than “bright.” In fact looking at their measurements, and by the descriptions of many owners, the Ascend Sierra line should be considered pretty neutral. Doing better than those for under 3k for the front 3 seems likely to be a challenge.
It would surprise me too, if you found sound quality in the electronics itself. Perhaps in the way room correction is applied or if you choose to eq in anyway, but in pure direct most with experience comparing the different brands say the AVRs and AVPs sound alike more than different.
At the end, it’s your ears and system though. It strikes me that the best way is to bring some different stuff in for side by side comparison in your room. Or, depending on your room, taking some measurements and looking at adding some treatments with some well placed panels to help absorb and/or diffract at some key points.