That list alone will see a very noticeable improvement in handling and ride. If you are fitting this all yourself, make sure you are liberal with the supplied grease that comes with the nolathane bushes. As already been said, they can get a bit noisy after a while. So put plenty of the grease on and it should see a number seasons without too much trouble.
Personally for me King Springs are a bit too harsh a ride for my liking. That's why I went Eibach Pro Kit springs. They are a cold rolled spring and tend to give a nicer ride quality over the kings. Price wise you can get them at a comparable price. But be sure to find out if they do them for your ute. Being live rear axle, I presume so but don't quote me. I know they do not do them for
IRS rear. A few of us here have Eibach Springs fitted to their live rear AU sedans and can all vouch for the quality.
As for sway bars, consider white line if you are serious about handling. But if not, an upgrade to nolathane bushes in your sway bar links will net a solid gain.
If you are keen to maintain comfort ride quality, I suggest not lowering the car too much below 1". You will notice an excellent handling improvement with what you have in that list of yours.