Oh neat! There is a dealer here in the Austin area that has two Caprices. Yes, they're pretty rare, practically a Holden Commodore. I shied away from them because I was concerned about the ease of finding replacement parts. Do you think you'll have any trouble with this?
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Sorry for the hijack, but I feel compelled to respond:
They are great rides, and yes, kind of rare. Parts are starting to disappear from dealer shelves, but many of the drivetrain and suspension parts from the Chevy SS, Camaro, G8 and GTO can be mixed and matched.
If you are more interested in the model, and in case the OP doesn't know, there's a forum for the Caprice:
http://www.newcaprice.com/
There are a lot of knowledgeable owners on that list, doing interesting things with these cars.