What lens for E-M5?
I'd say get the 12-50mm zoom lens. Th retail pice is $450-$499 range and you pay only $299 for the kits. ( this is what I get). And it does a really good job in shooting wide at 12mm ( most of the zoom lenses start at 14mm). Plus you can shoot macro with this lens even though it is not 1:2 or 1:1 ratio. Don't foret it is weather sealed lens too...ect.
I always suggest people to get at least one zoom lens as a basic kit. When you know what things you shoot most later then you can add another fast prime lens like the 20mm, 25mm or 45mm...etc. Good luck!!