The options I have looked at are BMR, Steeda, Maximum Performance, vorshlag, and Peddlers. I'm leaning toward the MP and BMR as they look to be made strong.
Of the vendors available,what is your preferred vendor and why?
Steeda allllllll day. Simple to use. Strong, excellent quality bearing. Easy to install. Strong metal parts. Maximum adjustability for camber (you don't need caster adjustment). Zero issues with mine.
I went Steeda as well though my Race mechanic was trying to talk me into the expensive Vorslag plates.
Then he put Steeda's on two of his other customers GT350's. So it seems he decided he likes them. And he never likes anything that he doesn't custom build, or that doesn't cost $$$.