With Chourio playing well now you hope that eliminates the OF need that seemed there a month or two back. Getting a more reliable starting P with all these injuries could be a help, but there is also a fair logic in just getting the guys back healthy to finish the year. But still, someone mid level who's reliable couldn't hurt. After that, I'd say a utility IF a level up to take Monasterio's spot would be the trade target. Not so much that it would matter if everyone is healthy, but if one of the 3 starters gets hurt you really don't want him as your every day guy.
Really not much of that matters for WS though. That just comes down to dumb luck at the right time. And I suppose getting the 2 seed instead of 3 could really be a big help on that front.