I think I understand now. You are comparing the sonics of the two amps using the same cable (Canare) and find the sound of the CSi to be different than the Modwright in a less than flattering way. You would like to change the cable to improve the sound. Correct?
If so you might try some Nordost cable in your budget. But be warned, some might feel that it opens up the sound, others might feel that it has the effect of changing the tonal balance, or that it might be bright. FWIW I suspect that you cannot really change the tone of your CSi by changing the cable enough to make it worthwhile, if at all. Sorry.
I'm not familar with the Coda product although I have heard that they are made by ex Threshold employees who worked for Nelson Pass and this product is much like the older Pass product designs. If that is the case perhaps what you really need is a different amp, for example a Bryston or something similar. FWIW.
Good luck