Suspension-where to start

[Zibodo]

OK my first post here. I bought a 1998 986 with 102K miles about 2 months ago on a whim for a weekend fun car and thought it might be a good project for me to work on with my son. The body and interior are good, and there were some minor things found in the PPI that I had fixed. The problem is that it just doesn’t feel tight when I drive it. Ther are no big clunks or rattles (but there are some minor rattles). I had the independent shop that did the PPI replace the lower front and rear control arm links and that helped but did not cure it. I just assume the suspension needs further work. I am trying to control the rate at which I spend money on this car so I would like to try to solve this in an incremental fashion. Can anyone help me identify the most most likely components to check, how to check, and help prioritize the order of repair/replacement.