A lot of these guys are really close so it can vary a lot depending on need, or potential, or position.. etc. If you like a guy a few spots below where I ranked him, just go with your gut ... though I think the tiers are pretty accurate.
Stephen Strasburg - obviously
Desmond Jennings - obviously #2
Dustin Ackley - chance at 2B makes him really tempting
Martin Perez - could be very good
Aroldis Chapman - ditto
Starlin Castro - a SS who has speed and pop is always valuable
Chris Carter - def will hit for power
Dominic Brown - has to develope a bit more but has the tools, that said If I had to pick one to bust ...
Michael Taylor - very solid bat, maybe not the upside but still very good and I doubt have much doubt he will hit
Kyle Drabek - AL East, darn ... still has the making of a TOR pitcher though
Jenrry Mejia - young, rushed, 1 plus pitch... potential but I hate the way the Mets try and develop guys
Casey Kelly - tough division but looks very safe to be a middle guy, possibly TOR
Jaff Decker - no real position but the kid can mash, he'd be up higher if he didnt just complete Low A
Tyler Matzek - h.s. arm w/ sky high potential, but how many of those go wrong?
Jacob Turner - ditto
Christian Friedrich - looks like a safe bet for a #3, possibly #2 ... not quite sold on him yet at the current levels he played
Ryan Westmoreland - might seem low but he really has yet to show much for the rankings he's been recieving, SS ball was nice but need more ... also the injuries are worrisome
Derek Norris - C who can mash? hopefully he doesn't get moved off
Josh Bell - power bat, could move to 1b, can't hit lefties yet
Lonnie Chisenall - for fantasy purposes he is nice, but I don't see the big potential
Mike Montgomery - almost what I said about Friedrich
Drew Storen - elite closer? possibly, I could see him going higher if someone wants to win now
Dee Gordon - so raw, but has speed to burn if he can make it
Wilmer Flores - still young, but needs developing
Hector Rondon - #3/#4 type?
Zach Britton - ditto
Shelby Miller - wouldn't be surprised if he busted or devloped into a #2/#3 ... but h.s. arms are so fickle