Hi Kincade
I think you've answered half of your own question. My system, at one point, was the system you are considering. I used to run my mains with the 8008BB. (a great amp for the $$.) I am still using the 8008x3 for my center and rear channels. Those 2 amps DO match up extremely well. Deffinitely get yourself the 8008x3. They can be gotten for approx $1350 here on AgoN. . Your final 2 channels can be taken care of with an Acurus A250 ( I used this before I upgradded to the 8008BB) or an Acurus A200 either of these amps can be purchased on AgoN for $600 or less. Since they all come from the same family they will (do) all have similar sonic signatures. Your system will match extremely well, assuming that your speakers are all well matched to each other. On top of that, your amps will basically be"bullet proof". Hope this helps.
Paul
I think you've answered half of your own question. My system, at one point, was the system you are considering. I used to run my mains with the 8008BB. (a great amp for the $$.) I am still using the 8008x3 for my center and rear channels. Those 2 amps DO match up extremely well. Deffinitely get yourself the 8008x3. They can be gotten for approx $1350 here on AgoN. . Your final 2 channels can be taken care of with an Acurus A250 ( I used this before I upgradded to the 8008BB) or an Acurus A200 either of these amps can be purchased on AgoN for $600 or less. Since they all come from the same family they will (do) all have similar sonic signatures. Your system will match extremely well, assuming that your speakers are all well matched to each other. On top of that, your amps will basically be"bullet proof". Hope this helps.
Paul