Ask HN: Remote team video chat suggestions?

Google Hangouts is OK but what out there is better? Use cases: - small meetings of 3-6 participants all in different places, with one person presenting - larger meetings of 7-20 participants, a subset of which are together in one room at headquarters, during which multiple people present Wishlist: - reasonable CPU usage -- doesn't make doing anything else during a meeting feel sluggish - high-quality audio - adjustable-quality video - hardware solution for headquarters so no one person has to host the meeting, and setup can be done once overall, not once per meeting - ability to choose which video feed to maximize (as opposed to always maximizing, say, the presenter)