What secondary camera if any for A850 photographer?

Stan, I forgot to mention that among all the lenses I have, only Tamron 70-300 USD and Sony 85/2.8 SAM can focus perfectly with A57. All my Zeiss and G lenses had various back focusing problem. There is no way a user can adjust AF sensor alignment screws (something I have done to A700 and A55 successfully). Sony Service will likely decline repair/adjustment request as they think all is within spec (happened to me twice). If you are getting A57 you need to bring your lens to test possible front/back focus thoroughly, make sure you get a "perfect" body. Cheers!