The best replacement for onassis is galella.

The best alternatives to onassis are rated as following:
★★★★★  galella
★★★★★  niarchos
★★★  christian dior
★  fleischer
★  ron galella
★  meyers
★  gallela

Your alternative for onassis is not listed? Suggest!
Speaking about onassis, one probably shouldn't forget about jackie kennedy.

Other search terms related to onassis and their ratings are:
★★★★★ jackie kennedy
★ jackie
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onassis
galella
niarchos