Counting stats certainly are a big deal. But so is having a great season on a contender. The Red Sox have had a pretty balanced group - Ellsbury has had the best season of the group (though Pedroia and Ortiz have their cases and not at all bad choices). He will pull votes on that basis. But since you asked.
Trout and Cabrera are far and away the best resumes - top 2 in fWAR, close this year instead of the rout it was last year, but definitely ahead of the pack.
Chris Davis and Evan Longoria will be way up there too. So there are 4 names.
While there are a lot of pitchers who deserve consideration, we know there is a severe anti-pitcher writers bias. As such, probably only Max Scherzer and his pitcher wins will get serious MVP consideration.
After that, it gets REALLY cloudy: Josh Donaldson, Adrian Beltre, Papi, Ellsbury, Pedroia, King Felix, Jason Kipnis, Manny Machado, Robinson Cano, Adam Jones ... could throw a blanket over all of them. Ellsbury's case is as good as any of them. He lacks the power numbers, but he is not going to put up slap hitter stats either - extra base hits is fine. Yes, defense and baserunning are not so valued by old fogey voters - but when you put up an eye popping counting statistic like his stolen base numbers, that gets noticed.