FHU hookups at the federal park in Jasper, Whistler's I think it's called? Park is super popular, and there's only a few FHU sites, so reserve now or ASAP. Very short walk to the actual town of Jasper, as well as tons of nearby trails connecting to the campground.
There's plenty of scenery at any campground you choose. Jasper and Banff are really quite different.
Near Banff, the Lake Louise federal campground is very nice, and located very close to two of the most beautiful lakes you'll ever see, Lake Louise and Lake Moraine. Although it's electric only or no-hookup. (Free, heated showers and restrooms on prem)
Just curious, why is FHU a requirement for you? It's been my experience most FHU campgrounds are just trailer parks that also allow transients (short term campers).