Not that it matters (Republicans want to throw it all out), but two other things that come to mind:
- a cap on profits on insurance companies, enforcing that a certain amount of revenue is going towards client coverage
- Allowing people up to the age of 26 to stay on their parents plan
There's a couple other bits like this as well.
I don't see how Republicans could not throw out the good parts. When you boil it down, the good parts of the ACA are the requirement to cover pre-existing conditions, and the individual mandate. The former is what's needed to ensure people aren't completely fucked over at the slightest opportunity, and the latter is needed to avoid destroying the insurance industry in the presence of the former. Republicans appear to be fundamentally opposed to both of those. Without them, what's left?