OP here. I've appreciated reading everyone's thoughts and opinions. We are just back from another fantastic DCL cruise, this one to the Bahamas!
I'd like to go back to Alaska in either 2014 or 2015 and I am seriously considering trying Princess or HAL, though, for a few reasons: Lower cost, easy 4 hour drive for us to Seattle rather than driving 8+ hours to Vancouver (especially with the I-5 bridge out), we've done the shows and activities on the classics, many of them several times now and it would be interesting to see what other lines offer. I'd also like to see Glacier Bay.
My boss is currently on his first ever cruise - on HAL to Alaska. Can't wait until he gets back to hear his thoughts and opinions!