I think you meant the BYS Seat rails to lower the stock seat.
As far as the modifications, really a HFC + exhaust along with a tune will wake the car up the most. If you want to chase numbers then @Urge has great products for that. Headwork, ITBs, Fluidampr, Header, and full exhaust.

Personally I have preferred doing smaller changes over time.

Subframe collars and good wheels + tires would be a great place to start! Congrats on re-joining the cult

 

Oh I'll have to look into those rails - I'd been looking at aftermarket seats that sit lower (specifically was comparing some blue Recaro's I'd seen in another Suzuka Blue S2k against a couple Mugen seats). I'm just a smidge over 6'4" but I just barely fit without my hair touching the soft top so any drop of the seat would be great.

Also thanks for the parts suggestion, i'll have to look at their offerings! like I said, my goal is to just sort of polish up what the car is (even if this means sacrificing a little 'comfort' for a little more performance) without going FI since that kind of kills the spirit of Honda's whole high-revving NA philosophy that the S2000 embodies.

For wheels 'n tires I'd been thinking to swap to some AP2 v1 wheels but I'm not seeing anything that's drastically better aftermarket - is that not really something that I should bother with? I know back a few years ago for AP1's at least Mugen MF10's were popular but finding a set in good condition is nigh impossible now and even if you do they're probably 5k+ just for the wheels which seems a little silly to me when I can get AP2 wheels for probably under $400.

Glad to be back - just anxious to get the car delivered hopefully today

 

Well boys... I'm back