Another vote for CM!
Each year we almost always have our first dinner at Chef Mickey's. With a PS its a pretty easy dinner if you're staying on the monorail or if you have a car.
If you're not staying on the monorail then that PS is a great way to get close in parking to the MK.
Stay away from 1900 Park Fair your first night. Unless things have changed, this place is chronically overbooked, slow, and loud. By the time we got to eat there our nerves were shot. We arrived early for our PS and didn't get seated until over an hour after our PS time. We saw others suffering the same fate each night we were at the GF.