I'd take both for sure before I'd spend money on either 80-400. As noted, you can use the 300 with a TC. Mine is a very sharp combo. I use my 80-200 even more, because it's so versatile for framing larger views of the bear in its habitat. In my experience those "bearitat" shots sell much better than run of the mill nostril and fang shots. The 300+TC will be fine for frame filling shots in many settings at Katmai, too.