I second Jdevine's suggestion to audition. Flat cables should be one choice (e.g. Nordost, goertz), bearlabs (borrow from the site), siltech, and purist -- all have relatively different geometries & can give you alead to what *type* of cable agrees with the system & your personal preferences. There are many other "representative" products, I just named a few that came to mind & I had tried when in a similar situation to yours. Good luck!
BEST CHOICE OF INTERCONNECTS
Equipment:Want to replace interconnects, price negotiable for right cables. Pleasing sound with detail, great soundstage and very neutral.All the equipment will remain only the IC cables will go first than speaker cables.
Speakers: Martin Logan Prodigy
Amp: Mark Levinson No.336
Preamp: Mark Levinson No. 380s
CD Player: Mark Levinson No. 390s
Anolog Fm Tuner: Magnum Dynalab MD102
Speaker Cable: Monster M2.4 (15ft. pr)
Interconnects: M1000i
Speakers: Martin Logan Prodigy
Amp: Mark Levinson No.336
Preamp: Mark Levinson No. 380s
CD Player: Mark Levinson No. 390s
Anolog Fm Tuner: Magnum Dynalab MD102
Speaker Cable: Monster M2.4 (15ft. pr)
Interconnects: M1000i