NW should be pretty good if you can get on one fo their new A330s, otherwise you're gonna get stuck on a DC10-30. CO
should be good, their 767-400ERs are supposedly step up very nicely as well as their 777-200s. Not too sure on AZ
, probally a 777-200 or a 767-300ER similar to DL
. Are you trying to cash in skymiles? If not, you have endless possibilities.