The 70's sounds heavenly for 'city' excursions...not so hot so you can go-go-go all day!
Well, the Christmas cruise is another that I'm considering and someone was just speculating that the Christmas cruise may be as much as the Baltic ones!

(I think based on the DVC points chart that was just released.) So if they were the same the alternate cost differences would be:
Air fare round trip to Orlando vs London
Pre-cruise hotel stay (and London may require an extra day due to jet lag)
Dollar to pound ratio for above
Cost difference in transfers to ship
More ($) excursions (more history!) for Baltic
Full payment in March or August (ish)
Cat 10 for 3 in Baltic vs having to have a more expensive Cat 6 for Christmas (required by sister)
non finincial considerations:
leaving Phoenix in hot June vs lovely December
possibility of seeing the new ship at the shipyards (I think that would be so cool....would skip Berlin for that)
must consider:
Monica will decide against Baltic on
DCL and I'll be put out of my misery!

I'm pretty sure I'm capable of rationalizing whatever/wherever I end up!