The Black Mamba is a highly regarded older Shunyata power cord.
I have not heard the DSi200 so I don't know for sure. But I have not seen an integrated that can out perform a separate amp and preamp. My guess is the difference would be huge.
The Ref 5se is an incredible preamp. At the price it goes for used the Ref 5se is a steal. A tube amp can be a bit more maintenance but I think it is worth it. The tubes need to be replaced every couple of years and the bias needs to be checked every so often. You get use to it. My Ref 110 and Ref 5se both have hours counters. So I can check how many hours are on my tubes at any point.
I will be honest, my system just amazes me every time I listen. At this point there is nothing I want to change or upgrade. I am truly happy with it.
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