If you have a STOCK suspension, you do NOT need those fancy LCAs. If you're using a reputable company, then I say it's a good mod if you're going to finish the handling package by starting with new LCAs like that. But if you're just going to bolt up new trailing arms just to bolt a stock sway bar to it and go no further, you're just pi$$ing up a rope, IMO.
You can make your stock non-braced trailing arms stronger if you weld up some spacers for the bolts, AND then weld a plate on the bottom of each LCA to box it in and use some poly bushings. Should be plenty strong for the street that way. As always- set your goal, then plan how to get there. Just don't start throwing money and parts at it. You'll be unhappy unless you're very lucky. If you start modding the suspension with all the cool kid parts, I'd get an LCA lowering kit for the axle-end hookup, too.
Although the thread is kinda old, it's all good. Still good info in the thread to bring to the top every now and again.