It is always best to record at the highest quality, which in the GH2's case is the 1080p24 FHD setting, or for action the 720p60 mode. You can play back directly on an hdtv using an HDMI lead - the camera end takes a mini HDMI plug. A free media player called VLC is avaliable on the net for windows and osx and this can play AVCHD files (.mts) on a computer. Interlaced modes are backward compatible with the old CRT monitors and tv's. Modern LCD displays are progressive only and you will see banding on a computer monitor when playing interlaced files unless the display deinterlaces automatically as most hdtv's do. Avoid interlaced modes unless you have a specific reason for using them.