Add another fast prime in the 40mm-50mm range and you'll be good to go...
But you need to decide if you are OK about manual focus. If you are, another option would be to use an old legacy standard lens from 35mm manual focus SLR - they can all be made to work on m43, and the quality of some of them is excellent. They tend to be reasonably priced too, as there are so many of them out there. The adaptors are inexpensive, too. I got a Fotodiox Nikon to M4/3 adaptor for $35 from Amazon for my old lenses.
If you feel you can handle, or want to handle, shooting manually, getting or borrowing, an older lens is a great way to go. Once you feel comfortable shooting manually, it gives you a greater sense of control and, for me at least, makes me slow down and be more conscious when shooting instead of blasting away. ;-)
If you scour the forums here, you'll find a ton of suggestions.
eBay can be okay, but frustrating, what with people running bid-bots and never knowing if you'll "win" until the last second.
KEH Photo sells an array of legacy lens, at reasonable prices and also has a handy rating system for lens condition.
http://www.keh.com/