Miss Annette, I once owned a Vivitar 283. Due to the uncertainty of the voltage, I gave the 283 away when I bought my Nikon D80. I then bought two used Nikon SB24 Speedlights. Now my four primary Nikon Speedlights are the Nikon SB80DX, Introduced in 2002. I continue to use the SB80DX with my full-frame Nikon camera.
The SB80DX has a built-in slave unit, which functions perfectly if the distance from another flash is not too great. The SB80DX also has secondary built-in defusing and flash-bounce features, and a model-specific diffuser dome is also available. With re-chargeable batteries, the Speedlights have always performed perfectly. It is very important to have the Speedlight user manual with you to learn and remember the settings. I also use radio triggers to fire the Speedlights, often adding umbrellas or soft boxes.