Wow, pretty cool to see so many listed but word to the wise, all but the first one are Chinook Premier models. Those are the cheaper models with not NEARLY as many cool features as the Concourse (top o the line) models. There is only one nicer than the Concourse which most here know is the Baja with factory 4WD, winch, high dollar paint, etc. There are the Glacier models too which are much more $ but they are longer and have slides etc., much more like a bigger motorhome. The Premier models listed are overpriced IMO but they are in Cali so that might be expected. I have noticed Chinooks are more popular and more expensive in the PNW closer to where they were made. You can get a really nice Concourse in the Southeast for 20-25k WHEN they come up, which is not too often or I'd probably own one.
Anyway, for comparison, look at things like the quality of cabinetry and the counter top surfaces between the Concourse and Premiers, and the paint too. The Premier has laminate and SS sink, where the Concourse had Corian with a molded sink from about 2000 up to the 2005 last year of production. The materials, cabinetry, etc. just look a lot nicer in the Concourse models. The Premiers listed have the same basic paint job, mostly white. I think the nicer Concourse models all had factory solar too, which the Premiers don't. Also, there are some Premiers floating around with a 5.4 I believe, where every Concourse from 97 on had a V10 with a few sporting a 7.3 diesel.
The mack daddy IMO if you could find it would be a 2005 Concourse with the V10/5R110 combo and the newest paint. I would expect to pay $40-50k for one of those, but not for one of these Premiers. Oh, unless you can find and afford a Baja.
Anyway, sorry for the long post. Hope it helps someone.