It doesn't have a source-switching remote, but a number of people recommended the Melos SHA-Gold as one of the best imaging pre-amps available, and it has a (supposedly great) headphone amp built in. Haven't heard it myself though...
http://www.stereophile.com/headphones/796melos/index.html
There's one available right now for $800:
http://app.audiogon.com/listings/melos-sha-gold-pre-amplifier-headphone-amp-for-grado
http://www.stereophile.com/headphones/796melos/index.html
There's one available right now for $800:
http://app.audiogon.com/listings/melos-sha-gold-pre-amplifier-headphone-amp-for-grado