You might want to try rolling an aire boat. I agree maravia boats are much harder to roll due to the thick armor coating
Thing i really like about aire is its quick to repair on the river (not that i have had to and i have had to patch a tear on an nrs boat)
Things i dont like is it seems i really need to unzip the boat and let it dry out thoroughly if it cant stay inflated at takeout
Also something you may consider: i've got both an 18' and 14' cat. The 18' i've found i can support four others for up to a week trip (no dogs) if we dont get crazy with gear. If you were to go with a similar setup with two piece frame you could possibly config with 18' tubes for a expedition and 14' tubes as a playboat
I think with the early spring hot deals i got both sets of tubes for about $4k, which is quite a bit cheaper than a E-160 (you will need to spend more for a frame on a cat and i'd bet my loaded down leopard is more stable and more manueverable than a 16' self bailer (but harder to row in wind)
If you are interested send me a pm and i'll send some pics of my boat fully loaded
Hey, if you want me to take a dump in a box and mark it "guaranteed", I will. I got spare time.