My experience has been that Levinson and Boulder generally have similar sounds. To me too clinical… not very musical. I bought my first piece of Audio Research gear 40 years ago. Over the ensuing decades have acquired all ARC reference gear. My system is now incredibly musical and absolutely mesmerizing. So, it is a question of taste.
I would recommend listening to an all ARC system… which would either draw you or repulse you. I’m not sure where your first impulse was to head toward ARC. But I know my dealer says (he has been to the plant and sells Boulder) is that folks with a lot of money that want to put in a home recording studio come in and buy it… for it’s revealing, but not necessarily musical qualities. I find ML very similar. Very different worlds. You can see my system, I fall 100% in the ARC camp. You may really like the ML Boulder camp… in which case… I would go with Boulder.