[mturmon]

The Festool dust extractors are similar to what you describe. I got one for list price, a bit over $700. It's quiet, has an accessory outlet that can turn the vac on, has an option for a remote, has big wheels so it doesn't get hung up when you pull it around. Etc.

The Festool is noticeably more than even the very good competitors - I think the Bosch is about $150 less, and there are others that are a bit more than the Festool.

But it's not like there's a $200 shop vac that's almost as good. There are such shop vacs -- but they're a different product entirely.