Morgan, by far. He's under-appreciated, but he's doing very well... 10 steals over the last month, hitting .352. He's playing for the Natinals, so he won't score as many runs as he would on a better team, but he's stealing bases in a big way.
Thanks for the help on mine. As far as starting Mogarn over A-Ram, it depends on your needs. A-Ram is the better player, but the question is what do you need more to win your league - A-Ram's HRs and RBIs or Morgan's SBs. If you need the SBs more, then start him and put A-Ram on the trading block. He should have enough value in a keeper league that you should be able to fill a need your team might have and help you win your league.
I'm kinda sort hoping that as time goes by, Aramis's shoulder will heal and he'll be a UTIL worthy player (A-Rod's at 3B). For a couple of weeks though, Morgan will get some time. If he does really well, I'll find a way to keep him around at least for this year.
I normally punt steals, but that's starting to hurt my runs, too, and now with Fowler, Morgan, and Hanley as everyday players for me, I'm getting a little better at being well rounded.