If you are seriously considering Alaska, you might as well get a trawler and forget the sailboat altogether. If you plan to start in SoCal you will be going against the prevailing winds up the coast. If you plan to start in Puget Sound and go up the inside passage you will be motoring the whole way anyway. We spent three and a half years cruising in the Pacific Northwest and could have left our sails in the bags for all the use they got.
Just my opinion
I guess thats why I'm looking for a duel purpose boat. I can't afford to buy a boat for a Alaska cruise and than turn around and sell it the year after when I come back to the Atlantic side and start Iisland hopping. Looking for one boat to do both.