Illamasqua Rampage: This obviously isn't kelly green, but the application of Claire's Kelly Green reminded me of the jelly deliciousness of Rampage. One coat of Rampage equals two coats of Kelly Green, so if you like that one-coat color but not the streaky look, Kelly Green is a nice choice.
Claire's Kelly Green: This is a true kelly green in my book. It's got a jelly texture that reaches full saturation at about two moderate (three thin) coats. It dries fairly matte, but with a topcoat it's genius.
Sally Hansen Going Green: Before Kelly Green I thought this was the closest thing to kelly green I'd find, but now against the Claire's polish, I see that it's somewhat soft and washed out in comparison. The shimmer is very beautiful, and I liked the polish fine till Claire's Kelly Green came along, now I'm not sure I care.
OPI Jade is the New Black: Another that isn't a Kelly Green, but I threw it in for comparisons sake. It's a muted rich green, and it's gorgeous. I've reviewed it more in detail here.