The AGX are okay struts, the Koni are the best IMHO. both will work with lowered springs with the nod going to the Koni. Springs are availble from H+R Eibach and Tein. I personally like the tein product.
I would not reccomend the sensa-trac for agressive driving or upgraded springs as they are not designed with this in mind.
also considering you have 100,000 miles on the factory struts I can prettry much say the damping of the factory units has been comprimised and will only get worse.
Jeff@ilpperformance.com
610-614-0903