who are the best baseball players now.?

In what way?... I'll name a few at each position...

C - Joe Mauer, Victor Martinez, Brian McCann, Yadier Molina
1B - Albert Pujols, Kevin Youklis, Justin Morneau, Joey Votto, Adrian Gonzalez, Ryan Howard, Mark Teixeira, Prince Fielder, Miguel Cabrera, Todd Helton
2B - Ian Kinsler, Chase Utley, Dustin Pedroia, Aaron Hill, Robinson Cano
SS - Hanley Ramirez, Jimmy Rollins, Troy Tulowitzki, Derek Jeter, Jose Reyes, Jason Bartlett
3B - Evan Longoria, David Wright, Chone Figgins, Alex Rodriguez, Pablo Sandoval, Michael Young, Mark Reynolds
LF - Matt Holliday, Jason Bay, Ryan Braun, Manny Ramirez, Raul Ibanez, Johnny Damon, Carlos Lee
CF - Adam Jones, Carlos Beltran, Matt Kemp, Torii Hunter, Jacoby Ellsbury, Shane Victorino
RF - Nick Markakis, Ichiro Suzuki, Jayson Werth, Bobby Abreu, Justin Upton,

Pitcher - Tim Lincecum, Roy Halladay, Cliff Lee, Jon Lester, Josh Beckett, Dan Haren, Johan Santana, CC Sabathia, Zack Greinke, Chris Carpenter, Adam Wainwright, Felix Hernandez.

I won't do relievers DH's and Relievers because they have too much of a specialized role.

And the crazy thing about this list, probably about 95% of them are absolutely elite. There's a freaking TON of talent in the MLB right now, especially at 1st base. Also, so many of these players are 27 and under. The level of young talent in baseball right now is just phenomenal.

David Ortiz, First Baseman of the Boston Red Sox.

C-Joe Mauer
1B-Albert Pujols
2B-Chase Utley
3B-Evan Longoria or Ryan Zimmerman
SS-Hanley Ramirez
OF-Carlos Beltran
OF-Matt Holliday
OF-Matt Kemp
SP-Zack Greinke

Depending on what you mean by "best". Statistically speaking, Zack Greinke, Chris Carpenter, Roy Halladay, Cliff Lee, and Mariano Rivera are just a few of the elite class of pitchers. Hitting wise, Ichiro, Pujols, Mauer, Hill and Lind are pretty solid too.

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It's kind of hard to just point out a few.. "best" means different things to everyone. It's also very hard to compare pitchers to fielders, and because pitchers in the AL don't bat.. it's just too hard to choose!