I have lots of photo/image-editing software. The GIMP is nice price and powerful, but I have always found it less than stable. (Although maybe that's because I use the GIMPShop version.) And it's far from intuitive for me, so I guess it all depends on what you gravitate toward.

Personally, I like Fireworks. (It's web-oriented, so if you're doing stuff for print, though, use something else.) But in general, my postwork (which is limited) is done in Photoshop CS3, although I do a lot of my exporting in Fireworks, as it gives more precise control. (Don't know about CS5 tho.)

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3