I've owned three DPs...a 40' Tourmaster non tag, a 40' Dynasty non tag and my current Executive with a tag and AquaHot. In answer to your question(s) both the tag AND the AquaHot are must haves. My wife likes long hot showers and there's no out time for the water heater to regenerate. I jump in right after her.
The tag is also a must have. The ride and comfort driving is second to none. The ONLY advice I'd give you is to ensure the tag is driver liftable. I can flip a switch and the tag lifts allowing a sharper turning radius and keeps the tag tires from dragging sideways on the pavement....Dennis