I have JKS track bars. Currie is worth a look, too, as well as Teraflex and Rock Krawler. (I'm confident that you will get other quality suggestions, these are just the particular ones I've studied when I was looking to buy)
I usually order from Northridge 4x4, I've had nothing but positive experiences with them, free shipping on orders over a hunsky. They are a forum vendor.
Also, you can order from quadratec, but make sure you talk to their rep on this forum, they typically waive the shipping cost for forum members.