I own ML Monolith II's. Although my system is bi-amped at one time it was not. My cable runs have always been very short--4 feet using monoblocks. I have tried quite a few cables, (many audioquest, cardas, purist audio design, straight wire, MIT) although I have not tried the Magnan's. The ones I found to be the best were AudioQuest Clear. If you can find a used set in 10 feet (8 feet is pretty easy to find, but 10 might be tougher) this is a great cable and should be inside your budget or close. These are really incredible speakers and I agree that they do better much of the newer line. I have made some modifications to mine, if you are ever interested in bi-amping or making some changes to the speaker and want to know another A-goner's experience--send me an e-mail.
