lots of channels: biamp or no?

hi all. i am running an operetta 5140 amp and a marantz sr 6003 for a home theater/2 channel system. speakers are all totem dreamcatcher, sub is carver true sub eq.
my question is, i will have 10 channels of amplification for 5 speakers. the totems are bi-ampable. should i biamp or not really worth it? what configuration would y'all suggest? 5 channels from the jaton and 5 from the marantz, the dreamcatchers are all 4 ohm except for the center which is 8. i can't really experiment because the cables are going in the wall, so the decision is somewhat final. thank you for any and all advice.