Thanks! Although ill definitely try 'mix and match'-ing, reading this is very reassuring indeed! So looks like ill have the full stack desktop micro version and a portable ican-idsd nano to take with me on the road.
i've read somewhere that although the iDSD micro has ipurifier on board, it can still benefit from the dedicated iPurifier? is that accurate?
I have an external iPurifier. Leaving it in the signal chain seemed to add nothing over the internal one.