The Panasonic fl28 can be used, can tilt too. There is a one from Sunpak, sold at Cathay, you can only use that for fill in, think it uses 2 AAA batteries. Both are limited to certain apertures.
I just got a Nikon SB-30. It's tiny and pocketable and offers a few different flash output options in both manual and automatic modes. Plus it will do TTL on Nikon film bodies if you have one. I am using it on my R2A and ZI, so it should work for you.