The Next is not a 2+ whitewater canoe. It's a flatwater float boat.
Do you want to sit on the bottom, sit on a tractor seat, or kneel off a seat (or thwart)? You haven't said. A saddle or pedestal is much safer for any whitewater running -- say I, who once almost drowned when my legs got trapped under a kneeling thwart in class 1 water.
If you want a solo open canoe with a kneeling/pedestal position that is optimized for quick maneuvering and play in class 2+ water, that would narrow it down to a shortish dedicated whitewater hull, or a significantly rockered combo hull such as Mad River Guide. I'm not up on the current models of that kind of WW canoe, but there are lots of used ones available from the past 40 years, starting with something like the Mad River (or Millbrook) Flashback and Perception HD1, up through various models of Blue Hole, Dagger, Mohawk, Whitesell, Old Town, Mad River, Millbrook, Hemlock, Nova Craft, Esquif, Western Canoeing, and others.