I've read that carastan is fairly close to caramel malt. Crystal 20 or caramel 20 would probably fit the bill just fine. The carastan at my HBS is carastan 20.
Allergy Warning: This post was made by a person who may be nuts
From the store: Nothing right now, how sad
Up Next: Thinking about an amber rye
Secondary: "Not as Pale as Death" pale ale (since april, man I hate bottling.)
In bottles: Lager than Life Beer, Rocky Raccoon Honey Lager, A nameless Imperial Stout (my first AG!)