You know, a larger practice doesn't necessarily mean an HMO. I worked with a rural Pediatric group practice that was literally just 3 Pediatricians and 2 NPs. They had the benifits of a larger practice (higher physician to employee ratio, relatively less cost from the physicial plant, vacation time, EMR, etc) but individual patients were still assigned to a particular physician for their entire childhood, the docs were still a huge part of the community, and no one was taking orders from any far off hospital administration.
BTW, does anyone think it's really impressive when you meet doctors who can remember their patients' names and personal stories based on a semi-annual 15 minute appointment? I'm going into fourth year and I still can't name at least a third of my classmates.