The Canon 5D Mk II has two options, the camera body by itself or the camera body and the Canon 24-105mm f/4L IS USM AF Lens. Some stores such as Adorama also package additional items with the camera such as memory cards, batteries, bags, cleaning tools, or a grip. These are not kits put together by Canon, they are just bundling additional items along with the Camera at one price point.

While considering your current lens lineup, the kit lens is a huge step up in terms of quality. The 24-105mm lens is a professional lens, and as such has many advanced features that your current lenses do not offer. Another thing to consider is that you save about $300 when you purchase this lens as part of the kit and not separately. That alone makes it a great option for many. Unlike many kit lenses, the 24-105mm is actually a very competitive option and well worth considering.

Overall, I think the 5D kit is a great option for your particular case. The Adorama "kits" are not really necessary and probably include knock off brand's that you don't need.