Lots of good advice in here so far. Driver mod/more track experience, etc will ultimately provide the best results, but it definitely helps to be able to tune your suspension and learn about how small adjustments can have a huge impact on performance.
With that said, they sky is the limit when it comes to suspension, which has a tremendous effect on how the car handles and the feedback it gives you as a driver.
Bilstein, Öhlins, and KW all make fantastic setups, and are suitable for a large majority of drivers. A step up from there in terms of both build quality, adjustability, performance, and price would be MCS or JRZ.
We have helped many drivers with our JRZ/Ground Control/Hyperco coilover setups for both street/daily and track applications, and have received nothing but positive feedback so far.
We wrote this article for our JRZ kits, but it's applicable to any coilover setup and should prove useful:
https://www.apexraceparts.com/blog/w...s-best-for-me/
--Dylan