Ditto. I don't know much about salvini, but I will say that I have found that I had a male JD I had to rehome due to his increasing aggression towards my O... but the female JD is as mild tempered as the O is. Not sure if that would be the case in all situations, but it leads me to believe a female JD would be an easier tankmate, in the long run.You can. Just keep an eye out for aggression from the JD/Salvini if the Oscar is the same size, but it will rapidly outgrow them.
Salvini are much nastier than people think... and capable of doing serious damage to even larger fish... mine took a chunk out of a severum that I couldn't believe was possible due to its size.
-Rich