I just ordered the Vivitar DF 200 flash unitonline from B&H Photo ($65 plus a few bucks to get it here)the other day for my Pana `20. Nick Trop gave the unit a big thumbs up in his review. I got a shipped confirmation e-mailyesterday from B&H and will test itout next weekend at "vintage/ol' geezer"rock concert in the Floriduh Keys. Edgar Winter and Rick Deringer are getting together for that show.
Also headin' my way is the DigipowerDPS9000 external battery pack from Cameraworld.com ($40 plus shipping) I`ve heard from several posters that the DPS outlasts the built in battery byat least 2x.
S`later, JH :G