I don’t know how to do a sample. I would think Westward Expansion would work best, but Colonial is fun too. IMHO, Colonial is more “girl-friendly” and Westward Expansion is a bit more “boy-friendly” We have enjoyed Westward Expansion more, but then, we have all boys.
The kits really include the items necessary, and they are NOT cheesy. If you need real paints and paintbrushes, you get them. For the Egyptian paddle doll, you get a wooden paddle, not a piece of cardstock. You only have to provide things that might spoil (for example, the orange for FruitnKhamen in the Egypt kit) There are also Bible verse memory cards and lovely pages for notebooks.
The lists of projects on the website is pretty comprehensive, so that should be a help. Just choose, IMO, the American history kit that your kids would like the most.