peralta, yikes is right, def. look for a better SS. stud RP, cant get any better than krod+joe nathan, and saito should be great. Your SP is a little risky for me, but its risk/reward and i see cc sabathia doing pretty good this year. solid team!
Love your Of, Sorie, Holliday, & Rios is a great combo. Kendrick & Weeks have lots of potential, but will they realize it this year?? Peralta is a scrub (sorry), and Martin is an all star candidate at his position this year, IMO. Hafner is a good pick, and even better if he gets 1b eligibility this year. Cuddyer & Gordon gives ya some nice hitting depth. Sp'ing is okay, closers looks real good.
Overall, for a 12-team league, you look pretty good. I would say your in good standing to be a player in your league. Gotta improve that SP'ing though, IMO, to really dominate.
Since it is a keeper league, this looks a little better. If it was a redraft, you could have some problems. 1b, ss, and 3b are all problem positions IMO. However, you have Gordon for 3B and if he busts out big, all the better for you. Hopefully Peralta can have a solid year and produce for you. Your OF and RP couldn't be much better, but your SP after your first 3 or 4 guys is very shaky. You may want to consider upgrading 1b first and then focusing on your SS and back of the rotation. But you have some pieces that people could find very valuable, like say a Gordon, and use them in trades to fill the problem posiitions listed above.
One type of deal you could make is to move Soriano for something like Rollins/DLee or Konerko, or something like ARam/Jeter.