Did you try Drawit? Drawit looks more like Fireworks (vector tools before rasterizing, non-destructive editng etc) which is great for creating web graphics. Also $39 which seems reasonable.
If you are comfortable using VIM (which has excellent keyboard support) there is a plugin script that lets you edit wordpress posts from inside VIM. All keyboard controlled.
Admit it, you miss Internet Explorer! You will get a Dell tomorrow :-)
You should try out Opera if you are concerned with memory usage. Bringing up a fairly heavy web page in Safari, FF, Camino and Opera shows that Opera is using the least amount of memory of them all.