Upgrading your CA setup is a very good idea if your axle will be out anyway. And the above statement is somewhat true. But I have to respectfully, completely disagree due to the fact that it is fundamentally flawed.
With a "3-link" front setup a track bar is still required as it gives the steering something to "push/pull" against. This is why it is technically a 4-link (3 CA's and on TB = 4 frame to axle attachement points) but people now refer to it as a 3-link because only 3 CA's are used (one UCA and two LCA's). In the rear however, the track bar can be removed if the upper and lower control arms are triangulated which, if they are triangulated correctly, will control lateral movement of the axle as well as the vertical and rotational movement.
But alot more goes into this than just buying a long arm kit and bolting it on. Honestly, if you do some research and are even slightly meticulous, you won't buy a kit at all. In fact, you'd run so far the other way you'd never look at a LA or SA "kit" ever again. Custom is the only way to go if you really want to do it right. There are simply too many variables in the equation to just throw something on there that a company produced. And don't get me wrong, I'm not saying expensive is the only way to go. Some people read "custom" incorrectly. Custom does not always mean expensive, but it usually does mean fine tuning ability.
Read through the thread posted below and the threads posted in it by Imped and do some google searching. Research is key in this field. Very small things can have large impacts on the overall handling of your jeep while it is offroad and on the road.
P.S. Ignore the pissing argument. It happens almost every time one of these questions comes up. Just read the facts about roll center, anti-squat, etc. and come back with questions you have. And like I said before, research, research, research. That's the only way you'll truly understand what goes on