I've been building my '08 up with the same intent of improving track capability without compromising its streetability too much (let's face it, most track-oriented mods don't improve streetability). One thing I can tell you is that it takes less car modification than you think to support running even in the Advanced run group.
I did take a different path, though. Koni yellows, Strano sta-bars, Steeda HD strut mounts, UMI endlinks for the front bar, Currie poly/Johnny-joint rear LCAs, and those MPSS tires/Forgestar wheels got me to the run groups that I run in now (I want you to notice that that was with the OE springs still in place). Only since then have I upped the front brakes and swapped the springs out for something firmer (BMR's GT500 Handling springs).
You'll want to be able to get camber out to something more negative than Ford's max-negative spec of -1.5°. I've found that something around -1.9°, maybe -2° is an OK setting if you don't want to keep resetting camber and toe every time you go to the track and once again when you're back to street driving. I also think that such an admittedly mild setting for track duty is reason to pick wheel widths more toward max-recommended for the tire size that you chose, the idea being to at least minimize lateral tire tread distortion (this distortion behaves a little like not having enough camber, so let's not compromise a compromised camber setting any further than necessary).
A couple of screenshots snapped from a 2015 track day video, with Aim Solo datalog information overlaid. These were taken when the car was still on its OE springs, tires fully warmed up (beyond where any sane street driving can put tire temperatures). I was 68 at the time and not inclined to drive like an idiot just to put up big numbers.
This little snippet was from the same video the stills were taken from, basically an easy-ish drive at a reasonably brisk pace. NJMP/Thunderbolt, if it matters.
'08 GT coupe, 5M, wheels, tires, pads, fluid, a few suspension mods . . . still almost stock height
'19 WRX, 6M (hers)
'01 Maxima 20AE, 5M (spare, winter driver)