you do know that no matter what program you use, if you convert VCD (MPEG-1 video) to DVD (MPEG-2 video), you will actually lose quality... it's the exact same thing as taking a 128 kbps MP3 and upsampling it to 320 kbps - the 320 kbps file will actually sound worse because it's been encoded twice using a lossy compression scheme.
having said that, i believe DVD-Lab will allow you to burn multiple VCDs or SVCDs to DVD discs that are playable in a normal settop DVD player, without doing any converting of the files. it's worth checking out, as this would also save you a lot of processing time.