Espinosa is hot right now, and he's an everyday player. I think it's a toss-up between him and Kendrick. Espinosa accumulates more plate appearances, but in general he'll run a little more hot-or-cold than Kendrick on a week-to-week basis. I look at it as a contributor (Kendrick) vs a guy who could help or hurt you in any given week (Espinosa). Also check out the schedule -- first, for # of games, also for splits. Kendrick has very even splits, Espinosa tends to hit lefties a little better.
Also, Utley's been pretty good lately, he's been about .265/.380/.445 since the beginning of August. (Guesstimating the averages -- I'm not doing the math.) I sort of wrote him off this year, so I haven't been paying a lot of attention, but he seems to be a decent option. Maybe someone who's been following him closely can say something more useful. Those are the 3 I'd consider.