Well , frankly your method of assessment is not really fair to the Bartok. However congratulations on realising this.
No, you do not need an Innuos Zenith Statement. In fact we have several reports of incompatibility with later Innuos models as they cannot run the only UPnP server software recommended by dCS, Minim Server ( now MinimServer 2).
A standard home media NAS plus MinimServer will do the job. Cost can be (depending on the storage etc. that you want) from 150 gbp or equivalent in your local currency plus 27 gbp for year one of MinimServer and 10 gbp thereafter. Given the entry price of Bartok this server cost is too small to be concerned about about.
You sound new to ripping and I would guess that you have probably made errors in what you have done so far even using the excellent dbpower amp. We have all been there and that little bible of computer audio for beginners:
Says ( or used to say ) that year one of ripping your CDs is followed by year two when you have to rip them all again having discovered that you did it wrong the first time!