I'm new to this technology. Old TV pic tube went green, so getting an LCD. Not much on pay TV (HBO, etc) but like PBS and family TV/movies. What older model Roku would accommodate our needs? Is there parental control with any of them?
Exactly this. Roku 3 will only work on TV sets with an HDMI. I'd like to add that while the Roku 3 is a nice machine, it includes a lot of things that really aren't important. The games aren't any better than what you can play on a used 16 bit game machine, the Cat 5 connection doesn't provide much better connectivity than wireless (if you have wireless n) and the USB port doesn't add anything if your TV / DVD / Blu-ray player has a functional USB port.