What NAD amplifier to get?

I'm getting an amplifier for a third system, so wouldn't like to spend much.

My options are a NAD C350, C316BEE or a 3020D. If I stretch a bit I could get a Micromega Myamp. Last option, Audiolab M-PWR. This will be driving a B&W speaker, CDM1, but I might change this later on...

The C350 is rather old, C316BEE is discontinued and I'd have to wait a bit to get the 3020D... The C350 I could get as a good used deal locally, which is pretty rare...

I just got the CDM1 and was a bit disappointed with the sound resolution, I'm used to a better sound. So not too confident on getting an old amp, except if it's really worth it.

Feedback is appreciated,

thanks