I would go with the Nalins too, definitely, there is no better option to bringing out the sound of those front speakers. But, I would use 5.25 all around. Much more balanced sound. Having a 6.5 right above your head, isn't going to really allow you to hear the front speakers, so it defeats the purpose of the Nalin adapter.(Sorry Big Sarge, don't mean to disagree with you on this part, just my opinion.) I like the theatre surround sound environment. Now, if you had powerful 6x9's in the back, this might sound good.
But, a Quadraphonic surround sound system with a sub is enough in my opinion. 4.1 is the way to go. But, 6.1 isn't bad either, if it is balanced. I just haven't seen a 7 Channel amp, but 5-channel amps are readily available.