LOL. I'm running stock and just considering switch to not that much different bilstein B6-es. Simply car is daily driven on far from good condition roads and i'm not willing to make it worse daily drive for sake of those few trackdays, where it seems fine enough for having fun, instead of hunting for every second off laptime. Also as all car expenses have to earn by myself, obviously choosing 10 trackdays over just 2 trackdays and rest of budget spent on mods
. Also making car faster will also make it less forgiving, harder to learn and will increase wear/spendings on wearables like tires/pads/rotors/fuel. Hence i thread very carefully with mods choice, their price/performancy, how they may compromise daily drivability.
Still, what imho should affect suspension choice most, is tire choice. Or in other words - their grip. Grippier tires (by themselves and/or due lot of aero downforce) = higher speeds/more side Gs, hence will benefit from stiffer spring/bump/rebound rates to not bottom out and to reduce roll, unfortunately compromising daily drivability. Even if later doesn't matter to you, compliance also means grip. If suspension is too stiff for tire grip/overloads tires, it will also mean that it may handle worse pavement deffects/kerbs on track, car jump on such more = less grip (thus less speed) and control. There is big difference what optimum suspension if one runs on stock primacies, good street tires like MPS4, track tires like Cup 2, or even slicks eg. Hoosiers. All proper suspension tuning shops should ask first - what tires (given that you already stated for what type of driving) and then advise based on that. Things like FI also may affect speed/tire loading in some track layout ands so does extra aero of splitter/diffuser/wing if on faster tracks, but tires usually is most important bit.
At lower budgets it's not as if all offerings are not considerable, but they often compromise several less important areas then single focused one, about only what they can given low pricepoint. Then again, on higher end often it's more of very adjustable and/or custom valved solutions, where one may depend a lot on competency of suspension shop helping to dial in or own skills to drive consistently, log, know what/how one needs to change to dial better instead of opposite, of choosing settings from hunch, myths, inconsistent amount of mistakes in previous laps.
So maybe state - what tires, and what budget (and maybe few other details you are thinking as relevant (eg. do you already have performance alignment, what other suspension mods or other mods on car there is already), to better advise basing on). Also imho good place to ask or search more info would be state-side ft86club.com forum. For example this thread
. Or track/HPDE related section