I've got the Firm Feel Stage 2 box in my Aspen and it was worth every dollar. It's what they recommended for my car and intended use.
Had the KYB Gas Adjust shocks and as mentioned, WAY to stiff. It didn't ride like a lumber wagon, those ride smoother, lol. Switched to Monroe OE Spectrum front and rear and am happy with them. Added bonus, they're black so you don't have to paint them.
Don't recall where I got all the front end parts. Some were NAPA, some PST, etc. Got a new left t-bar from Chrysler when they were still available, the right side end link was NAPA and the pivot bushing was an NOS service kit (bushing, saddle, top plate, friction plate and bolts). It lasted about one year and now there's a Firm Feel urethane one on that side.
Pretty sure all the sway bar pieces were NAPA, end links, pivot bushings and pivot bracket insulators. Some of the stuff is N/A from NAPA now. This was back in the mid 2000's.
Used poly k-frame mount insulators from Spring 'n Things. Stiff enough to keep the subframe from moving around but just enough give to insulate from road shock and noise.