I'd avoid the old Monogram UH-1B Hog that was also released by Revell with different decals. Basically, if it comes with the nose mounted ball gun and a short cabin airframe, it's the old monogram kit.
Hobby Boss's Huey is a mixed bag because it was designed to be easy assembly. I've read in several places that it will not sit without some weight added towards the nose or a clear rod to prop up the tail. It is a UH-1C.
The Italeri one, and I think Revell of Germany also releases it, used to be the best UH-1D. The Esci/AMT/Ertl one is not as good. For whatever reason, the Italeri UH-1D is hard to find, but they also released it as the AB-205. Same kit, different decals. The one kit called the best is the Italeri/Heller UH-1N, but is a later version (also called AB-212)