I was hoping someone with a lot more knowledge than me would reply, my recollection is that a few peolple have been a tad upset with OME suspension.
I don't know if Kings make their stuff, but if they did it would be to the specs they requested (hopefully)
I have heard a lot of good things about Kings though.
This is a great site to arrange a trip, but to be honest there is a slim pool of people willing to contribute on the forum, I would suggest to ask the same questions on 4x4 earth and 4wd action, and maybe a toyota forum. You can never get enough info. You will be stuck with that suspension for a while, so get it right.
Go and visit a few 4x4 shops, you'll soon get a feel for who is a clown and who knows what they are talking about.
Hope that helps.