Jeff Rowlands Amp and Dac vs. VAC amp and DAC

Rinpoche, if you consider Purist I strongly suggest you talk to member albertporter and also perhaps to Jim Aud, Purist designer. Albert has a wealth of knoweldge of high end audio. He is currently also Purist Audio and High Fidelity cables dealer. This should not affect his objectivity much. He might be able to send you some demo cables to try and would give you a very good price on new cables.
There is a reason why there are many Purist models. You would be unable to figure out by yourself which one would be best for you unless you try them all. If Albert cannot answer your questions he will contact those who can.

I have not heard the newest Purist cables, only older ones. If you pushed me to take my somewhat educated wild guess, I would say that without spending too much the current Aqueous Luminist edition for a little over $1000 should be about right. If this is too expensive - probably Poseidon. Nothing lower than that, that's for sure.

Will do!!!!!! 

If its a standard balanced IC that is needed in particular, where sound differences among wires should be minimal if any, I would forego all the high end audio brands and look at pro audio vendors for a good quality wire for reasonable cost and call it a day.  I bet Almarg knows some good candidates there.