from what i've seen, orion is damn cool...i've been checking out propellerhead's reason, as well...it seems more well organized and powerful (which it better be, at $400) though i haven't been able to explore it too thoroughly, at just 20 minutes at a time...both packages are worth checking out, i'm probably going to stick with orion...i may actually buy it, too.
even though you can't save .wav output in the demo, there's still ways around that...try patching the speaker out jack on your soundcard into your favorite recorder...dat, minidisc, even cassette tape, whatever you have handy...then patch the recorder into the line in jack, and record a .wav in whichever wav editor you like to use...i figured that one out about a year ago with SimSynth....same kind of demo with just save and wav output disabled.