DVD-Audiofile and L-Plex both create iso files that are gapless during playback.
exactly. DVD-Audiofile is great for creating disc images of DVD-Audio discs, and L-Plex is great for creating disc images of DVD-Video discs (with your PCM audio as the audio, and a blank video).
either way, you end up with an .ISO file (disc image). I then use ImgBurn to burn the image to DVD. this is also a free little program.