Personally I wouldn't do an oscar, but from my experience you have other options beside smaller fish or more angels. Fish I've kept with angels include severums, the milder geo types, satanoperca, mesonauta, discus, I've even had them with a gold edged green terror (depends on the individual and may not always work, but captive bred individuals I've had have been quite tolerant-- not that I'd do it myself, but I even saw one with discus once and the discus were fine), guianacara (not that they're big, but they work ime). The list goes on, really. With some combinations you can't 100% guarantee it and it's just something you'd have to try. It can depend on the individual fish, size of your angelfish, etc. But then you could also say that about angelfish, some are more aggressive than others.
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