I'm no suspension expert, but my $ .02 worth. I've never heard of a worn-out sway bar. I've upgraded to larger diameter sway bars in the past for improved handling, but unless the bushing housing wore into the sway bar, I would question a replacement suggestion. The other items sound more like high wear items, probably legit. I'm a DIY'er of the highest order. The usual issue I have is in the diagnosing of the problem. I'd attempt your list myself, not that it's something everyone would/should do. Good luck on getting your issues corrected.