I think you had a great draft, I'm not too high on Pena and don't think most people are but like you said you really can't pass him up in the 8th round.
Love your hitting, some good balance there, if I had to point out any weakness its your 3rd OF spot, Votto might not get a lot of playing time under Dusty and his love for vets. Butler isn't a bad backup though, he is a Royal though so don't expect real big numbers but hes a nice late rd pick.
Your pitching certainly doesn't wow me but you made the right choice of taking starters who strikeout a lot of hitters. I like Shields and Gorz, but I tend to avoid the potential sophomore slump pitchers if they pitch anything like last year you have a good staff.
As for Schmidt and Ryan, BJ Ryan is going to start the year on the DL but I would go ahead and throw him in your DL spot and stick it out. So far from what I hear Schmidt is in the backend rotation but only if he does make the rotation, don't be too surprised if hes injured again.
Nice job, I'd say with the team you drafted it was a good investment