Thanks for the response Francois!
Yep, but do not my answer as the only voice ;) It is just that the people I work with are usually really picky about that.
I imagined approximately the same, but should try Mars (I don't know not much about it). Or, try Xcode4 :(
If Mars is not stable/productive enough and you are familiar with Ruby you can probably have a look at MacRuby (http://www.macruby.org/) and a free online book (http://ofps.oreilly.com/titles/9781449380373/).
Good luck !
