all inclusive is definitely the way to go. ^ as far as seabourn went, the spirit selection was very good, and the prices for premium brands were fantastic. (like $75 for 2oz of Louis XIII

) i would hate to have to worry about onboard tipping all the time too..
but i do agree, until 2009 (seabourn's new ships) silversea does have better design. silversea also goes to alaska, which i presume seabourn will resume once they have the new ships.
seadream is the smallest, and my understanding is it is the most casual and has the best food and beverage.
all 3 are definitely worth the premium over regent.
although for alaska id go with regent. last i looked, they started from $2500, while silversea was from $5500. 2.2X is a little too much of a premium IMHO.