For people who like the feel of rubber, the RTABs are the one place where it is acceptable to go poly. The NVH difference (RTABs only) is so small that if you didn't drive your car for a week in between you would not notice a difference.
Powerflex or AKG. AKG makes a part that is slightly softer than Powerflex and apparently cannot be distinguished from stock rubber. Stock rubber with limiters is more of a PITA than it's worth. Yes, I've tried that solution also.