I'm high on Milledge. I've also invested about $250 in baseball cards of him, so I have a reason to love the man. Anyway, he has great speed, projects to hit for power as well. If you want to call him the next anything, call him a poor man's Griffey, Jr. I think he'll top out at 35 homers, but he could very well steal a good 20-25 bases a year. He'll also hit over .300, making him more of a 5 category player than Beltran. He's great defensively, like Cam, but will probably be a better hitter than him. Milledge could very well fill out and hit more homers. He hit an impressive amount for a rather short season last year due to injuries...
He definitely needs to work on his plate discipline, though. Lastings did take great steps in that. The 5-category tool set is most definitely there. He's the toolsiest kid in the minors. Period.
Guzman has gaudy power...but his maturity is a concern. He can be compared to Beltre in that sense. Guzman has freakish power and will prob. move to 3B.
Hamels is a top pitching prospect, but the injury risk is a problem. I also tend to prefer hitters to pitchers anyway (plus lower risk) and those two other guys are gaudy prospects. Having them above Hamels is more praise to them than taking something away from Cole. He projects as a better prospect for a team than in fantasy because he is a lefty.