We use Pro Tools HD for all our sessions. We usually record at 96Khz, unless otherwise requested by a client. We use the Digi 192's as converters, and have recently upgraded to an Antalope clock at Capitol.
Al mixes through the analog console to a Tascam 2 channel recorder through a JCF Audio converter at 192KHz. I usually then drop those files into a Pro Tools session to deliver to mastering. We don't deliver any kind of stems, unless specifically requested by the client, and then we deliver as few as possible.