Hola,
I finally junked my Vivitar 285 after it broke the shoe twice and melted the battery terminal. Best investment I made so far. So now I'm looking for better alternative if there's any. Has higher GN (My 285 GN is 20 in meter) and can be abused with slightly higher voltage (I used 7.4v lithium battery for fast recycling) and around the same price is even better (I got my 285 for $15 LOL). Any advice for the alternative?
It depends were in the world you are located. I for instance very rarely come across any Vivitar flash, but countless of other makes.
I never paid more than 5€ for any on-camera flash (except for those by the camera-makers).
I can't advise on the higher feed voltage, as I never tried that.