From experience DNA Genetics/RP same company, and female seeds, vision seeds even had some decent offerings for cheap. I haven't been growing long but those are what I have had success with. Lots of people are raving about Bohdi right now, I haven't tried his gear but there's lots of nice pics on here.
I take it you're looking for kushy strains DNA/RP have a good selection of those. I hear people find good OG's in Cali Connections gear too, but I've never ran and there is a lot of controversy surrounding their customer service to put it kindly.
I was pumped when I seen UrbanRemo at the cup puffing on some FlowerBomb Kush pumping it up for them to release something that doesn't have the characteristics they claimed.
I did some looking around and couldn't find one, but I am sure some other breeder has released a Green Crack OG Kush cross. I bet someone with access to the actual elites in Cali could do a better job then some jagoff in Amsterdam. But that's opinion