I have the J34 and love it, but haven't tried the packs these other guys are talking about. They might well be better but the J34 works great for me.
I have a Kifaru paratarp and parastove I really like for shelter. I use a GI poncho for a groundsheet
Can't give a great choice for a pad and bag I'm not real happy with what I have. I'd like to try a Kifaru Slickbag. Alaska is known to be wet so if you go down you will want to be sure it stays dry. Might be worth looking at one of the best synthetics but it will be heavier. Maybe a down bag and bivy sack would be better in the floorless shelter, I've thought about that also.