According to Chris Howard of Apple Matters, GIMPShop is among his "Dozen Mac Gems Unearthed in 2005".
After my search for a low cost decent image editor proved fruitless, it was both a delight and relief to find GimpShop, a hacked version of The Gimp but with a Photoshop like interface. Obviously I wasn’t the only one confused beyond sanity by The Gimp’s interface!
I'm glad Chris found GIMPShop. A "low cost decent image editor" may be hard to find. Luckily, GIMPShop is free. 8^)