I purchased a used Naim Hi Line interconnect cable from my dealer a few years ago. I don’t think I would have stretched to the cost of buying a new cable. So you may want to check with your dealer to see if any used ones are hanging out in the shop. If you not then maybe you could ask for a loaner to do a side by side comparison against the standard cable that is provided with the Naim gear.
I have a Hi-line and the standard Naim cable. I am currently doing a trial of Morgana.
I have lots of boxes and hence cables, Hiline sounds better to me, but the gap is small enough that one can spend time wondering it it’s real at all until a different LP makes it clear. Others have appreciated it on my hi-fimore than me- younger or better trained ears - but we all agree that the standard Naim cable is good.
Hi line is fragile IME in pins and the plastic tags that hold the case shut. It also works best if positioned carefully - not wrapped around a power lead, say.
So far, Morgana sounds better than Hiline, but again the gap is not big. It is easier to use -see above.
Morgana interconnects seem to make a good less difference than SNAICs and Burndies. A big plus for WH cables seems to be proper screening, but that matters more to those with badly-organised cables.
If I had your boxes, I’d use the basis Naim lavender cable and spend your money elsewhere.