Mine is vented down to the basement, across the basement ceiling and out the foundation of the house. It's not ideal - I lose suction by having all those turns and that long run - but it's fine. I started with a 720 rated hood, so it's still good, even diminished, and I don't often run it on high anyway. Mine is a Kobe 36" under cab SS hood. You can check out their web site below. They are quiet. Mine has baffles and is easy to clean. They have lots of styles, so you can look through them and see if any appeal to you or go with the style of your kitchen. I got mine from Ventingdirect.com for over $900, but I don't know if that's much less than a Viking. HTH

Here is a link that might be useful: Kobe Hoods

I am also really enjoying my Kobe under cabinet vent hood. Rated up to 720 but I usually run it on "quiet mode" which you can truly hardly hear. It is pretty too- nicer fit and finish than some other brands we considered.