This may sound like a stretch.... but I am always amazed by where it takes me.
Go to google, and enter: Baseball Fantasy Average Draft Position
ADP works sometimes too.
Mock Draft Central is a good place to practice, but that google search will take you to sites that builds on what MDC is doing with their "Average Draft Position". That site is coming on like gangbusters, and I no longer need to run my own mocks where I play.
The search will take you to not just other sites, but other opinions. When I make my cheatsheets, I have two. How I value guys by position, and a master of list of where guys are going lately. I cross them off that ADP list as we draft. I use that list as a way to determine who my opponents are likely to draft next.
Example: If I am up in a 12 team snake draft, and half way thru the draft I see someone I want and he is among the eight players at the top of the list, I had better get him now, because the ADP suggests he will not be there when my turn comes around again. But if he is number 20 on the list, I can afford the roll the dice and leave him there. Chance are he will still be there when I am up again.
Sorry for the long post, but I think it is good to have a goal in mind when preparing for a draft. I want two lists... one by position based on my opinion, and a master ADP list to use... keeping in mind that I will look at IT and say "here is how the rest of the league will draft".
Good Luck to you.