I'm a big fan of the Polish modules, these are what got me hooked into Polish history when I first read them. I've run the set (more or less) twice.
Black Madonna and Free City of Krakow could go together very nicely, they cover adjacent or overlapping areas, and both can set up a fair number of actions that PCs might pursue. That could turn into long-term games just sitting in that area. Madonna came out later than the rest, but it could easily be the first one. I'd pick one or the other of these two, if you could only have one.
Pirates of Vistula can start from either of those, it begins with an NPC hiring the PCs to accompany him on his river voyage. That flows directly into Ruins of Warsaw, which sets up a big fight with a warlord.
Going Home could take place after any of these. Like Pirates, its centerpiece is a journey, but with a lot more options.
The second round of Europe modules include White Eagle, which is a sequel to Krakow and Black Madonna, covering what those groups of NPCs did between the summers of 2000 and '01. Return to Warsaw is the same thing, for the citizens of that area. Bear's Den is supposed to be in southeast Poland/northeastern Ukraine, and could flow as a job from either a Warsaw or Krakow start point. It's my least favorite European module.
Both Krakow and Black Madonna start with the PCs finding a valuable item, and then describe the NPC players and their organizations in the area. There is not set course for the PCs to follow, which is a model I rather liked.
That's my $0.02.
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As for the ones you have, I would gently shepherd your group from Kalisz to Krakow, have them get hired by the NPC captain who will take them to Warsaw. Break up the game, and restart a new group to play Last Sub. That flows right into Med. Cruise, but you could alter the locations of that one, and play it as Baltic cruise instead. Then, you can pick up your old party and take them back to the States. Pick Red star, lone star or Urban guerrilla next-- have the sub drop off either party and have fun. That's 3-4 campaigns right there, IMO.
I liked Lone star the most, I think it's the only US module I finished.
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My Twilight claim to fame: I ran "Allegheny Uprising" at Allegheny College, spring of 1988.
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