The only sites that are certainly Preferred are 100, 200 and 300... they have been Preferred before the reno's, continue to be during, and will be after. 700 is currently Preferred, but I suspect it's conversion will begin shortly. There have been reports of 1700 & 1900 being used temporarily as Preferred. And currently 900, 1000, 1100, 1600 and 1800 meet the definition of Preferred loops but AFAIK they are being used as Full. I would feel a bit jilted to be in one of these former Full sites in a non-preferred location and pay Preferred rates for them, so I would request either 200 (non-pets) or 300 (pets) personally. Loop 100 has too much traffic for me.