As of today I am the proud owner of a EM-5 with the "kit-ish" 40-150 f/4-5.6 lens. I'm looking for some recommendations on another good "walkaround" lens to complement this one. I'm not opposed to something within this focal range as long as it is something that will provide a strong benefit for portraits, street, etc. I picked this up so I would have something with me all the time and want another lens or two that will complement this zoom and keep me covered in pretty much any scenario...all without breaking the bank. Any thoughts? From what I understand, this camera is compatible with older models of lenses too, not just the current generation...I'm not worried about having the latest and greatest, just want something solid. Thanks!