You're best bet for a tight steering assembly is a track bar with no slop, a DSS, and the Luke's Links. I wouldn't do the latter until you're seeing evidence of wear on the stock ball joints. But since you've done that already, it's a moot point.
If any movement is seen at the ball joint end of the track bar where it attaches at the frame it's shot. You can Luke's Link it or just replace it. You said that is fine too.
So now it appears to leave the last option to be your steering gear. Again, have someone work the steering wheel while you look at the pitman arm. If there's play in the shaft, you can buy some time by putting in a DSS. It's better to do that before there is play, however. Some guys have fiddled with the little set screw on the top of the gear and supposedly tightened things up turning that just a fraction of a turn. But others said it didn't do any good or made things worse.
I replaced my PS pump a month ago with one from PSC and the guy there said he was surprised I had 150,000 on my stock steering gear. He said they are notorious for failing early on the Dodge CTDs. Maybe my DSS is adding life. But I'm hearing a groan and the new PS pump didn't fix it, so maybe the gear is due.
The one last spot to check is your steering shaft, but slop like you're describing isn't typical of a worn shaft or the steering column bushing. Usually that causes just a little slop there and often noises like popping that you can feel.
-Jay