I paddled a Malibu 2 out of Florida. Had granddaughters too small to paddle in the front and so I was essentially solo with an extra load. The 2 XL is only slightly larger than the 2 and only weighs 11 pounds more. There are bigger solo kayaks than the 2 XL. The Scrambler would hold a kid but it would be cramped and as big as you are I would definitely recommend the 2 XL. As long as the kids aren't too big you could probably haul 2. And you won't have any trouble taking a 68 lb kayak to water.
My kayak STRIPER2. I don't go too fast but I go pretty far.