Only one that really sticks out is the second K-Line aluminum Golden State dome, the K4632-29841c Golden Outlook.
I wasn't aware a second dome car was made for the set (I have all the other cars), and by the time I found out about it, they were long gone. I only ever saw the car in an Ebay listing (where the above photo came from) sometime in 2006, and I bailed out after the bid price exceeded $110. Never saw another after that.
---PCJ (but still looking)