Er,
the "best available"? 100% full coverage on everything no co-pay.
Yes, they exist. No, I have no clue how to get it
Back in 1999/2000 I worked for a dot com (who else would do this) that had a blue cross plan that was 100% paid. You simply showed up to the dentist and that was that. Same went for doctor/hospital. I used both, both times for "emergency" like work (two root canals when I hit my two front teeth on something and cracked the root, and a real bad ingrown toenail from a broken toe) and it truly was the easiest process of all time.
Granted, insurance like that is hardly worth the cost. You'll end up paying far more than you'd ever save compared to more 'traditional' plans. I heard back then (7 years ago!) that they paid in excess of $1200/mo per employee for that.
Ah, the good old days