Baymac. Has worked well for my family so far. Many direct billing options worldwide. Premiums are fairly reasonable. I dropped a single plan last year and switched to a Baymac family plan. The new family premium was less than $100 more than the single O-care plan I was paying back stateside.
Wife had a ER visit last summer (USA) with the new policy. Worked as expected. Only out of pocket was the deductible and the rest was covered in full (direct bill).