The trackbar bushings, especially if original, could look very worn or cracked. The thing to look for in the brackets are to see if the bolt holes are ovaled, which would allow for a lot of movement.
Unfortunately, I don't believe anyone sells replacement trackbar bushings for the OE trackbar. You either buy another complete OE trackbar with new bushings, or an aftermarket trackbar/bushings for lifted Jeeps.
I'd personally start with the low-hanging fruit and see if the tires/wheels need to be rebalanced first off, then get into the other parts. Believe me, about 90% of WJ owners have had some sort of wobble on the front end at some point.
2006 5.7l WK