Hi Greg,
Another option is Affinity Photo 2,
https://affinity.serif.com/en-gb/photo/, for a one-off payment of £67.99 and is available for the Mac.
I've recently switched to it from Paintshop Pro and it has been a major step up, it has in-painting/content aware fill and decent selection tools.
I'll second Barrie's recommendation if NikEffects, I use it with DxO photolab and as a plugin for Affinity. For all apps, there is normally a 30 day trial before you buy, worth spending the effort and watching a few Youtube videos on potential packages.