I've been trying to find a good corkboard app, but I haven't been able to tell if there's one out there that does what I need it to just based on the reviews. The main features I need:

- large board size (minimum 10 cards x 4)
- multiple board support
- zoom capability; zoom in to see a particular section of board or out to see the whole thing
- ability to draw directly onto board as well as posting content in card form
- support for multiple text colors

I don't mind paying for such an app, but I don't want to waste money on trying out apps that won't suit my needs. (I can do without the last two points, but the others are dealbreakers.) Does such an app exist, or am I just stuck waiting until someone develops one? Any recommendations are appreciated.