Tough to give up Trout but Votto/Bautista are huge and Lester is not that hard to replace and Xander not likely to help much until sept and even then might be part time so since you need production now i would pull the trigger.
Cespedes/ Latos tough call but i like the OFers on your waiver wire quite a bit so maybe he's expendable (I'd look first at Yelich and then Arcia)
As tough as it would be to lose Trout, I think that would be the better deal to take. Your pitching seems stronger and deeper than your sticks at this point, and the Trout deal could actually make your offense better overall. Not often I feel good about a deal where you give up the best individual player, but this seems like a case where I'd consider it.
I'd grab Wheeler and/or Yelich regardless.
As of 8/4/13 C:Napoli 1B:Goldshmidt 2B:Kinsler, Gyorko SS:Tulo, Profar 3B:Longoria, Machado, Middlebrooks OF:Harper, J. Upton, AGon, R. Davis, Venable SP:Scherzer, Minor, Ryu, E.Santana, Beachy, Samardzja, J.Johnson (DL), T.Ross RP:Perez, Rodney, Farquar
If your looking to win this year, then I would make the Votto trade. Your giving up Trout but getting two great players in return. Andrus is a solid short stop also since he should provide a nice amount of stolen bases.