Rusty's does custom arms too, but check out Clayton if you have a little extra $$...really good stuff...the square tubing was a little odd to me at first, but it makes sense.
They ought to replace the whole track bar for $95! If you're just replacing the bushings on the lower end (since a stock track bar has a tie-rod type end on the upper 'frame' side), you can do that yourself in 15-20 min. You won't have any front-end alignment issues to deal with as long as you...
I'm running a Trutrac front and a full Detroit in the rear...the rear Detroit was the best mod I ever did. Winter drives are no problem, but your tires will wear a bit sooner in the rear...just remember to rotate often. Most importantly, don't have a heart attack everytime you hear that...
If you decide to go much higher than 4.5"(via poly spacers/shackles or taller springs), you'll need to address your steering...your rod-ends will be just about maxed out. I didn't see any steering mods on your list, so I assume you are running the stock "Y" set-up. Might want to get a...