You can swap true JJs (made by Currie, not RC) into some of the RC arms. Which is what you want at each end if you're leaning toward a very proven, durable, serviceable, rebuildable joint. Might be a worthwhile budget option if the arms are adjustable. Otherwise Currie/Savvy, Rokmen, Clayton, amd Core 4x4 all offer very nice arms with with JJs. Beyond that you have Metal Cloak with their Duroflex joint which seems to have great chaeactweistics but aren't as durable long terms as the JJ. Synergy, Clayton, and Rancho also offer a dual durometer bushing of near idenrical design. Worth considering as well. Teraflex also offers a clevite style bushing that has good feedback but to me is waste of $ if you're buying adjustable arms.