Having McCann, Wright, Beltran, and Webb in a keeper league is a great start! I'd say stick with Tulo at SS for now, and see how he does. With only 10 teams, the market for Bobby Crosby probably isn't too strong right now.
I would suggest that you start lobbying for having fewer than 10 keepers. I'd say 4, 5, 6 at the most. Otherwise your draft this time next year will be pretty boring. Good luck.