Silversea would probably be the most similar cruise line to Regent in that it has similar standard cabins and is all inclusive, even if the ships are somewhat smaller than the Voyager and the Mariner. We were on CAMEL this year and it was fine. I didn't notice a cruise on the Silversea Web site in Northern Europe that was exactly in your time frame, though there were some that were close. Also, many Silversea cruises that aren't significantly discounted tend to be even higher than Regent.

We like Regent a lot also, but we're trying Oceania in February around S. America in a PH cabin, which is similar to Regent's standard cabins on the Voyager and the Mariner. The price was right, and we think we can live with signing for drinks and paying for tips separately. I noticed they had a cruise in Northern Europe during what I think is your time frame. See this Oceania Cruise . If we really like Oceania, we might even take this itinerary at another time.

There have been numerous threads on LCT and on Cruise Critic comparing the lines.

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Eugene

Edited to add: Great minds think alike. I was posting my 2 cents while Ted's posted.