I have never had a problem donating to the core team but it seems that most people like donating for a specific goal. Maybe you could think up a donation goal for when 0.9 is released. More devs and content seem to be needed and popular but I'm sure there are other creative ideas. It doesn't need to be just one idea/goal. Better be quick about it as I hear the release is set for Oct. 15. As far as how much, again goals make it easier to put a number on it.
BTW thanks for all you do for the project. I'm playing the lottery for tomorrow, cross your fingers.