With a 65" screen size, you don't really want to skimp on speaker size, small satellites need not apply. And I'm not saying larger floorstanders are needed either, but may be what you want. Speakers are definitely a subjective preference depending on what your ears like. As Bandphan alluded to, a new sub may be needed to up the ante for the HT experience.
For zoning, any of the receivers/pre-pro we recommend will be capable and your wants may determine one configuration over another. For example, the Onkyo 1/3/5007s can do a 5.2 setup as well as power 2 stereo zones without the need for separate amplification. But don’t expect the receiver’s amps to power a multitude of speakers on 1 zone. This would be handled better with a separate outboard amp.