Model changes year to year for new buyer?

Im looking at a 2006 16' international CCD signature this weekend. It would be my first camper and I've done a lot of research (read most every topic) but was hoping some owners who have looked at, or owned different years could tell me the specific differences between the 06 and a new sport, and maybe other year differences. It doesn't have the rear wrap around windows unfortunitely which I was really looking for. Mostly what does the CCD international signature blah blah blah get you in 06 versus what you get now? What's an average value? The price seems high, as does every single 16 I look at versus larger models of the same vintage. Do they just hold their value? I don't want a microwave so that's not an issue, the rock guard things are a nice touch, is there a difference with the way the partition pulls out? Thanks for any info you may have come across you could provide to a potential new airstream owner.