I don't know why only Chris has mentioned Serif's other packages, Photoplus and Drawplus. I use PP as a PS replacement and it pretty much has everything PS does with a very PS like interface for only 80 quid. The two notable missing features are, for me, PDF import (which you can do with Inkscape, which I love, and Gimp, which I don't love as much, just because of the UI) and non-importing of PSD text as text, which only one package seems to do. That package is Photoline, which seems to be very full featured and which I'm thinking about switching to, just for this text import.
Just about everything else I've tried (and I've tried a lot) are missing more features.