Re: GIMP is pretty good
"No, it's not. I've used it for about 10 years now, and it's still pretty shite, and nowhere near the capabilities of Photoshop. I simply refuse to use Adobe so I just soldier on"
I'd suggest looking at the Affinity and Skylum/Macphun ranges of softwares to see if they meet your needs. They get good reviews and, best of all, they are available for a one off purchase cost.