I like #2 as delivered without the mars light. I too have been going back and forth with my decision on the passenger car sets. From pictures I've seen, the later cars with the maroon stripe through the windows were later cars better used with #4.
I was hoping for the "beaver tail" look that the 2006 cataloged observation car had. These are still really nice. It looks like these are smooth side cars that Lionel is offering which I think are the early cars used with either #1 or #2. The ribsided cars were used later. I'm leaning towards the set without the maroon stripe along with the add in cars shown on pages 26-27.
I look forward to placing my preorder with my favorite dealer, Sommerfeld's in Milwaukee, (Butler) Wisconsin. .....Robbie