I'm pretty shocked that you could get Guerrero and Cabrera in a 12 team league. Every draft I've done (3 of them) Cabrera has gone #8, #8, #14 while Guerrero was obviosuly selected in the Top 5. Maybe it's a keeper league and you did not mention it.
If it's not, I wish I was in that league.
Your offense is going to be very very good, but I think you need to find some more RP. You are, as Red LEader said, going to be hurting in holds and saves. If Shields or Linebrink are available, drop Kearns or Jenkins to get one of those guys.
Man, I'm still in shock that you somehow got those 2 guys in a 12 team league. Please explain