The North Coast Limited is a good choice. The B&O Capitol Limited would look absolutely fantastic, I forgot about that one!
These yearly passenger trains are one of the best things Walthers has going for them, they are very popular and the runs tend to do well.
From the LHS I go to, when they spoke to their Walthers rep. regarding these passenger trains, he remarked that the idea was to do the Super Chief, and see how the sales were, with the Empire Builder train as a possible "year after" follow up, if sales weren't up to par, it would end with the Super Chief. Well we saw how well that did, hence the Empire Builder introduction, that pushed sales even farther; and the decision was made to continue a "series" of yearly famed passenger trains.
The 75th Walthers Anniversary featured the Twin Cities Hiawatha (good choice), I am not a MILW modeler at all, but when I saw the cars, I was blown away.
The 20th Century Ltd. (I have a prototypical 18 car set)
UP City of Everywhere (another great choice)
PRR Broadway Limited for 2011 (Can't WAIT to place my reservation)
One can only assume that a "western" train will be for 2012, perhaps maybe a Gulf coast train, hmmmm. SP Sunset?
Tom