The best bounce flash solution for GX1.

A friend of mine just got himself a GX1. He would like to buy an external flash that does bounce flash. I used to have Panasonic 360 and I now have Metz 50 AF-1. Although they are great flashes, they are just too big for a GX1. For a better flash than the built in flash that is still small and does bounce flash, what would you recommend.

Thanks