I've currently been using Vegas 5 + DVD Architech 2 and have decided to upgrade to Vegas 6 (without DVD Architech 3 preferred) for some of the HDV friendly features. Will I still retain the ablility to encode to AC3 like in Vegas 5 + DVD. Does the AC3 encoder from Vegas 5+DVD "carry over" to Vegas 6 or must you purchase the full Vegas 6 + DVD to keep the AC3 encoding ability?