Pretty interesting when looking at the positions and league, i.e. all the top 1B in my mind are in the NL (not overall, just for their first half performance this year), most of the top 2B are in the NL too. Here's how I would vote:
American League (2nd choice)
C-Joe Mauer (Victor Martinez)
1B-Jim Thome (David Ortiz/Paul Konerko)
2B-Jose Lopez (Ty Wiggington)
SS-Miguel Tejada (Derek Jeter)
3B-Alex Rodriguez (Troy Glaus)
OF-Ichiro Suzuki
OF-Carl Crawford
OF-Vernon Wells (Manny Ramirez, Alex Rios, Vladimir Guerrero)
SP-Johan Santana
CP-Jonathan Papelbon
National League
C-Johnny Estrada (Michael Barrett)
1B-Albert Pujols (Ryan Howard/Lance Berkman)
2B-Dan Uggla (Chase Utley/Brandon Phillips)
SS-Jose Reyes (Felipe Lopez)
3B-David Wright (Miguel Cabrera)
OF-Alfonso Soriano
OF-Jason Bay
OF-Matt Holliday (Carlos Lee, Carlos Beltran, Andruw Jones)
SP-Brandon Webb
RP-Tom Gordon