MJS
Technical Tinkerer
Don't know anything about your cables but I have owned a CB 250 and a 250.2 (which is what you have) and the 250.2 is far less fussy about cables. I can recommend Chord Epic and Sarum or Telerium from experience, either of them I found vastly preferable to Naca5, which, to my ears, is crude and lacking.
250.2 is as fussy (electrically) as the older 250 so you should still be using low capacitance cable of the correct length.