The German-manufactured boated don't have pillars inside the hulls so that makes more room for stowing gear and it makes it a lot easier to stow in the first place not having to work around the pillar. EZ to take out the bulkhead, too, put a little gear in the bow to level off your trim, then replace the bulkhead. Boats by Prijon and Eskimo both fall into this category. Also, if you self-support runs have a lot of flatwater, get something old school and long because it'll be faster on the flats (long to me is 10'+).
If you're not doing really hard whitewater, you may want to consider an IK, or inflatable kayak, too. They've got some big advantages, too, EZ in-and-out, good in shallow water (they float a bit higher), easier to repair, deflate and pack option if you need to hike to the river. Personally, I wouldn't feel comfortable in one in hard pushy water and they ain't fast on the flats either. I just can't maneuver and IK like a hardshell so I'm a little biased to a hardshell, but if I was doing a slow and shallow multi-day, they'd probably be a great choice.
A third option is a regular large-volume creeker if your self-support is technical. I'm sure manufacturers would not recommend this, but you can take out foam pillars pretty easy. I did a three day trip this year in my Habitat 80 and I took out the foam pillar in the stern only. It make it a lot easier to get stuff back there, but the integrity of the hull was compromised. At night though, my two Ridgerest pads were oh so comfy that folding my stern was the last thought on my mind. I would not recommend removing any pillars in the bow though just because I value my legs and you don't store much gear up front anyway.
I think CKS or somebody else had some good advice on packing gear, might want to read up on that, too. Essentially, weight distribution should be centered side-to-side and keep as little weight as possible from the resting in the ends of you boat. This makes it handle better when pivoting or boofing.
So I'm curious, what kind of trips are you looking at? The Stikine?