Any of the ACI centers would work well, as would any of the smaller speaker models that could be used as surrounds. As far as subs, that really depends on room size and how loud you want it to be able to go. The G3s have pretty stout 10" woofers that do well into the mid 30s on their own, so probably a single Titan would be a starting point. If you can find one or two, you cannot go wrong with the Maestro:)