Speaker and amp help

Hi I was hoping for some expert advice on creating a home theater. I currently have a pair of infinity kappa 8.1 speakers rated at 6ohm with a need for 300 watts per channel. I had asked awhile back about a good amp for these and received excellent advice so I'm back for more advice.

Could someone tell me what my best bet for surrounds would be? I have seen infinity kappa surrounds...on this site...but was wondering how a pair of kappa 7.1 would work. Also I would like to know if two multichannel amps would be my best bet in this situation? I was thinking something with 5 channels 200 watts per channel and then perhaps 4 channel 100 watts per channel to bi amp all four of these speakers and a kappa center. Lastly because these are 6 ohm should I be looking at only 4ohm amps?

Sorry about the insane amount of questions and thanks in advance.