Using a non mainstream OS as main system I prefer a very mainstream addition. The Windows computer is required rarely only, but then it should work (meaning: do the stuff that isn't working on MorphOS).
I also use OS X from time to time, but - cough - I prefer Windows over OS X (I know it better than OS X and think with average knowledge Windows offers more flexibility than OS X where everything is pretty nice and working as long as you do the things as intended (dictated!), but if you want to leave that path it gets adventurous).