Lots of choices out there...
In my experience with painting interior and exteriors of properties, I have found a good latex paint is the best for longevity and application on wood, stucco and concrete. Oil base paints have alot of restrictions, and harder to clean up, which isn't so bad but, I prefer a water base latex.
The brand I have been using for over 20 years is Behr. This company makes a wide variety of paints, stains and stabilizers, for multiple surfaces.
Keep in mind when using a latex paint is, that your preparation is the key to a long lasting finish. I painted my own home with Behr in 1994 and the trim is just starting to show signs (as of 2012) that the trim is in need of attention. I scraped, filled, sanded and in some areas re-filled - sanded, then primed the whole house before the three color scheme I went with.
There are other good paints out there... But I prefer Behr.
I hope this helps, [hint] have a 'Prime the House Party', good luck, Don