New to Rolex- Need advice!

[lexeroo96]

I am in the market for a my first preowned ladies Rolex for around $3500. I want to know which features/watches are most likely to retain value over time. I am interested in a two tone datejust, preferably MOP or light dial, fluted bezel. It is imperative that all parts are original. How has the datejust changed from 80's, 90's? I want as new as possible in my price range. Also, what is most reputable online dealer as I cannot locate a preowned ladies watch locally. I am not opposed to a ladies Omega Seamaster, I just do not have any idea how they retain value. Any advice or help would be greatly appreciated!