The answer is it depends on what you want.
If you want coverage for most but not everyone and not every prexisting condition, then some variation of the GOP 2008 plan.
If you want the whole ball of wax, i.e. universal coverage, prexisting conditions, kids covered well into young adulthood, then you are likely looking at some form of Govt funded or single payer system.
There is no good easy answer and the ACA has made the landscape much worse.