Well, I tested out several aftermarket track bars on my ProRock 60 but have for the most part ONLY run the same ol' factory one that came with my Jeep back in 2007. The ONLY other factory track bar I have seen break was the one on EVO1 and that was during the Vegas to Reno race. I guess I just don't wheel hard enough.
Assuming you have the relocation bracket on your axle, you may find it difficult to run something like a TeraFlex track bar as the diameter of it is quite big. Back when I was testing one out, I had to clearance the bracket a bit to make it work. I've tested out several different versions of the JKS track bar before too and by the 3 version, it didn't flex as much and I would assume it would work pretty well now too. I'm not too fond of any track bars that use polyurethane joints or heims as they tend to be noisy and get sloppy.