I think a Cinema display would fold over a full size extended keyboard quite nicely. I really hate simple tiny keyboards, and I need all the screen real estate I can get for non-linear editing apps. Plus there would be more space for batteries, expansions, etc. I could happily live with. Maybe someone in readerland can answer that.
Noise levels are very idiosyncratic and mutable.
For example, this WallStreet I'm typing on was once whisper-quiet, but the HD has gradually become noisier. Also depends on the brand and type of drive. The infamous video inverter whine that affects some Lombards and WallStreets is a defect. I don't know whether it's been fixed in Pismo or not. The Toshiba HDs used in some Pismos reportedly have a higher pitched hum than the IBM drives used in Lombard.