I'm going to have to risk the grapes/tomatoes/rotten eggs of wrath here and state that Robin's got my vote as UberBabe of Trek - and that includes all iterations up to and including (God save us) ENT. I've got a massive weakness for brunettes - especially ones with those gorgeous high cheekbones and jawlines that could set churchbells ringing. Other than Robin, Michelle Forbes (rrrowwlll) is fighting for the top spot; although there were a host of others that got the thumbs up.
I do agree that the portrayal of Saavik - appearances of the actresses aside - did vary markedly between II and III. Kirstie seemed to play off the emotional end of it (like those tears at the "...most human," line weren't a dead giveaway), where Robin was more to-the-point Vulcan...although I do recall Vonda McIntyre's novellization had her having a meltdown and attacking the Klingons after David was murdered. Seemed in character for me, though, and I could easily imagine Robin pulling it off, had it been included on screen.
Is the slant of this thread changing a bit, or is it just me?