I forget the two girls names too.
But, I think it will be the lighter blonde who gets to stay. Just looking at her in the commercials, she gives off such a "ho" vibe and seems unpredictable. Like she will spread her gets for any guy she's interested in. The guys will jump on those qualities and want her stay.
Meanwhile, the brunette is more emotionally reserved. She even complained in the previews that she didn't like this process of elimination and doesn't seem that happy overall. I think she won't be staying. She kind of doesn't have the personality to make it through a whole season.