I think the Tokicos are good shocks for the Mustang and the Bilstiens are good too but the Konis IMO are a step up. The Konis are just too expensive. I have the tokico Illuminas set on the max setting which is great for the smooth roads I drive on. If you drive on rougher roads they can be set softer and may be great for that too.
I think 300 bucks is a bit high for used Tokicos so I'd try and offer less. To me, they should be able to be had for less than half the cost of new and that's only if they have very low miles on them.
If you are not changing to lowering springs or don't have a problem with alignment then the CC plates my not be needed although I believe the Mustang needs them since the Factory settings for Caster can't be adjusted. The Camber has minimal adjustment too that is usually all used up in the variences of assembly/manufacturing tolerances.
The Steeda, MM, D&D, QA1 and other CC plates are all good, I have the Steeda 4 bolt and they are nice. My son picked up a set of J & M 4 bolts for his GT that function every bit as well as my Steedas and cost $70 less.
