I have been playing with my own wild starter for several months now. And I have really liked the results. I just do a basic starter (water flower) and feed it and work it. It is down to just taking care of it (feeding) several times a week.
I used a basic technique from Chad Robertson of Tartine (the best bread I have ever had).
You can Look Inside on Amazon - http://www.amazon.com/Tartine-Bread-Chad-Robertson/dp/0811870413
And the basics of making a starter are available on page 45. It can be fun, but the trick is to listen to what the bugs want.
I have not tried any other yeast (bought). I really wanted the dough to express what is right here.