Well, I'd be a bit skittish on Salty just because even if he's not starting the year in AAA, he's going to split time with Gerald Laird at C. Salty's defense as a backstop hasn't quite come along, but I'd hope he gets time at 1B.
Howie Kendrick could be a good bargain, but I don't think he does anything earth-shattering; he just falls in the category of being respectable enough for his position like Kelly Johnson. One thing that Kendrick has in his favor is he's slated to hit 2nd. His value was rather suspect when he was hitting 6th/7th. Kendrick doesn't really have a deal of power upside, but word has it he's going to be green-lighted more. However, in Mike Scioscia's system, aggressive baserunning is encouraged and so it's really not going to be any different for Kendrick. If he gives you 100 R, 15 HR from the two-hole, he's a good choice.
Alex Gordon came around well last year, but I don't think he'll post his career best year with respect to his lofty ceiling this year. Next year, perhaps, but he's too talented not to burst this year or in the near future.
I'm not quite as worried as King Felix's health, as the M's tend to take good care with him, but like a lot of young pitchers who take on a 150-200 IP, it takes its toll. The kid is what, 21-22? He's always had brilliant stuff but he gets himself too deep into counts, which could take some mileage on his arm. Remember another key to your pitching is also Liriano's health and like I said, if he can throw his slider with more regularity, which is of course, his filthy pitch.