I have the GoLite Breeze, Jam Pack, and the Pinacle.
I love the breeze but it doesn't have much room for a larger load. I think any more than 3 days food with this pack would be a really hard push.
The Jam Pack is an Iron Man of a pack. This was my first GoLite and it is fantastic. I have feelings for this pack. It is a work horse. I have put way over 30 pounds in it and on it out of neccesity (I had to cover someone else who was hurt). It held up like a real champ to this day. I figure it has at least a year straight using this pack every day and it is still strong.
The Pinnacle. I love how this pack converts. It isn't the lightest UL pack (Large, 1 pound 9 ounces for mine) but it is an equal to the Jam. The convertability (you can make it really small in volume) and the cavernous size made it fantastic for taking my little ones out, carry a tent and all of the food (getting me very close to 30 pounds). I was able to use it for Scouting and suprise the heck out of everyone because of it's light weight and volume.
The other great thing about it is I can actually just stuff the bivy, sleeping bag and other gear into the bottom without worrying about stuff sacks (just use a trash bag). I am packed in the morning in about 5 minutes and on the trail. No primping and prep other than what I do before bed. I just wish they would throw a big mesh outer pocket on this thing. That is really my only complaint.
Good luck and happy adventures!