I would go with the same brand cable. I had bad luck mixing speaker cables on a pair of bi-wired speakers. The mids and highs seemed disconnected from the bass.
DIY Jumper Suggestions
I would like to make a DIY jumper cable for my Mirage OMD 28's. My speaker cables are NBS Omega IV which are already configured in biwire, but the OMD28's have 3 terminals on the back ("tri-wired"). Seeing that the length will be very short, I am able to go "flat out" on these jumpers ie buy some really nice wire. Does anyone have wire suggestions? I was either considering a very low gauge (8awg) silver plated military wire or something like Mundorf gold/silver wire. Any tips appreciated. Thanks.