If you are going to audition that combo. Then please also add a parasound halo to your short list. I had lent my amp to a friend when I was moving house. He was previously using a combination of Naim nait 5si with PMC gold DB1i's. After hearing the parasound thorough his speakers for almost a month, he has bought a parasound for himself. In his opinion, much like mine, the PMC and parasound sound really good together.
However the superuniti is a big step ahead of the Naim nait 5si. So not sure which one you will prefer. But no harm auditioning that combo if you can find one.