If you can get the original with its expansions, I would definitely go that way. The graphics are simpler, but also clearer. I think the expansions add a lot once you get into the game.
Agree. I have the Silverline and went back and picked up a used copy of the big-box game. The Silverline overall is a nicer presentation, and the small footprint is nice, but the lack of expansion support argues in favor of the older edition if it and expansions can be found at reasonable prices.