Currently I own the C326BEE and I consider it a very fine amp for the money.
I am courious if changing to any of the other two would improve the sound of my humble system. I am not concerned by the connectivity options offered (analog/digital vs digital only) because both amps would suit my other components in that regard. The power of both is more than sufficient given the size of my room.
I am leaning toward the D3020 smply because it is the half price of the D7050. If the sound quality is much in favour of the D7050, I could try to stretch my budget.
The question of all questions: Is the change worth considering?