I've got the Revell kit with Cobra Company's conversion and the Cutting Edge Modelworks' cockpit and weapons sets. The latter are required since Cobra Company only provides the exterior parts. However, the cockpit is not highly visible and the weapons are not always carried. Furthermore, the Revell SG/G is a reissue with a new sprue to update the helicopter to modern standards. These include the composite rotor blades that are used by the Pave Lows, so that's definitely the kit to buy. The refueling probe is NOT included in Cobra Company's conversion but it is included in Revell's kit. The probe is pretty basic and I had to scratchbuild some detail onto mine to get it to look right. I think that's about all. If you need anything else, contact me via email: adrake2@bigred.unl.edu
I've got some emails about the Pave Low from some of it's crew chiefs that are very informative. Just send me an email and I'll pass them on. Best wishes with your project.