I've been a long-time four-thirds user (E-500), and am now looking to upgrade to the OM-D EM-5. I plan on doing some traveling over the next year and want to make sure I have the appropriate lenses for a long trip. I like the idea of the 12-50 kit lens on the OM-D as a decent all-around lens with weather sealing, and I have been debating over what other lenses I should add to this for a good travel kit. I want to have at least one fast prime to be used for street photography. I also enjoy landscape photography, and would like to take a lens along that could be used for that. Looking forward to hearing people's opinions on this.