| Eibach Springs 0.8 inch drop New OEM stock shocks (allows you to keep adjustability option if your Z has it) 300 Degree Camber Kit Upgraded Sway Bars I think that is the "best bang for your buck" upgrade from a stock setup (especially a sagging stock setup).
I think the AGXs are cheaper than OEM shocks. If you don't care for the adjustability option, AGXs are fine. I have no experience with the ebay springs.
Raj 
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