Hi Rob? Roy? Ralph? I'm Marc and tonight I represent the insomniac British branch of the forum!
The first person to ask questions of is yourself. You must have reasons for focusing in on the Argosy 24. I know for alot of people it's about what tow vehicle they have or want and the maximum size of trailer it will pull. I would recommend you get inside a few Airstreams and see if they fit you.
On another thread today I read Andy Rogozinski of InlandRV liken buying an Airstream to considering marriage, so give yourself time to look around for such a big commitment. Search the buying advice forums or try the classifieds.
Flirt with a few choices until you fall in love!
Good luck with your search!