
I always wanted my Dad to get a Xantia back in the 90's, but instead to replace the old faithful Renault 21, a C5 was purchased in 2003....after much convincing from me!

So didn't really happen. I did find him an exclusive S2 for 2K which nearly tempted him in 2002!
I agree with you about the S1 XM's...infact all S1 Citroens. They just seem nicer somehow. I'm sure someone will have one somewhere! There is that K reg one on Autotrader and Ebay...although it is £2-3K, with a thwack in the back. Only 21K on the clock however.
I have driven a S1 12V V6 before which went very nicely, but never sampled the 24V's both S1 and S2. That would be a great thing to do, is have all the different engine models lined up and try them all one after the other and compare. For fun really if anything!
Best of luck for future XM hunting.