Are there any integrated amps with a built in DAC?

I believe Redwine audio has such a product.I have the poweramp version,and am very happy .

The Peachtree Decco that Knownothing suggested in a great piece of gear for the money. I'm using one with a Macbook Pro, streaming to an Airport Express and then through Toslink into the Decco. I can also connect the Macbook Pro durectly to the USB input of the Decco DAC.

It has a tube preamp section and I'm using the preamp outputs of the Decco to drive a tube amp, though the internal amp of the Decco is pretty good, too.

Musical Fidelity A5.5 has an USB input

Bryston B100 SST. Given the high praise the latest Bryston amps are getting, and given my 4-day audition of the new Bryston DAC (fabulous!), I'd take a look. The DAC board is an option, as is a MM/MC board.

I currently use a Naim Supernait and one of its inputs is an Apple TV with very satisfying results.