In reply to Dark-Cloud:
You can add Sigma 19mm/30mm/60mm primes, too. They are dirt cheap and the overall build/image quality is very surprising.
For my own E-PL5, I went for kit 14-42mm lens, Lumix 20mm F1.7 and Sigma 60mm F/2.8. I use kit lens only when out in city or don't care about the quality too much. 20mm is always in the bag and sometimes used as only lens even on multi-day trips. I spent far too much time with 50mm lens on Full Frame that (I guess) I can work with such focal length quite well. I *usually* take 60mm out to mountains too unless I am very concerned about the weight or I know I won't be getting any use out of such long lens. You can still capture climbers from further and it works quite well to take a fraction of a landscape quite well.
I probably wouldn't mind something very long, but I used to have 320mm (FF equivalent) lens and I rarely used such a focal length. It's also heavy. I was also thinking of getting something ultra wide, but I wouldn't be able to justify to put another lens in my bag.