I too am partial to the sound of the vibrandoneon (which I have) and the Clavietta (which I had at one point). The Hammond 44 HP (which I also have) is also in the same ballpark tone-wise. For me, my dream instrument would hit that sweet spot between accordion and harmonica in tone, with the richness of a warm accordion sound, and the presence of a good harmonica.
BTW, Ofir, bending is an integral part of accordion playing in some cultures like the Roma.
As well, for me the instrument should be neither too light nor too heavy. I want it to feel substantial in my hand, when I play it, but at the same time, have it be balanced nicely.