The first player I will recommend is Zack Cozart of the Cincinnati Reds. In his first full season as the Red's starting shortstop, Zack batted .246, hit 15 home runs, and scored 72 runs. I think each of those numbers are repeatable in 2013, and I even think there will be a slight uptick in his in his batting average, given his 80% contact rate.
The second middle infielder I think can give value at the end of the draft is Andrelton Simmons, shortstop for the Atlanta Braves. Andrelton took over for Tyler Pastornicky last year, and never looked back. He came up with the reputation of being more valuable with his glove than his bat, but quickly proved to have some value offensively, and thus, have the ability to help a fantasy owner. In 2013 I believe Mr. Simmons will bat .266, steal 14 bags, and contribute 6 home runs to boot. Once again, not the type of player you want as your starting shortstop, but, certainly the type of player who can provide value at the end of a draft.
Finally, we come to a middle infielder who may not be a middle infielder, at all, by the end of 2013; Mike Aviles. Cleveland picked up Mike in a bizarre series of transactions, and he is now back up at all the infield positions, except catcher. (But, just give him time....) I will tell you ahead of time that I like Mike Aviles. He has versatility and provides a little something in each category. Most importantly, for fantasy purposes, while he is only eligible at shortstop now, he backs up Lonnie Chisenhall at third, and, give Chisenhall's history, Mike may have that job by the end of April. If that occurs, look for Mike to bat .251, hit 9 home runs, steal 11 bags, score 58 runs, and drive in 61. Given Mike's back up status, currently, you should be able to wait for him until the late rounds, and possibly even the reserve round.
In order to be successful, you need to be able to ignore certain areas of the draft, to get players that provide more value, than you might otherwise get, drafting based on scarcity. The above three middle infielders may provide that type of value.