I too was pretty compulsive when I bought my first ti.
I bought a car cover before I even owned the car.
I wrecked that one a few years ago and bout a 96 ti.
First, you gotta slow down. The go pedal can get you into trouble.
If you really like driving, get involved with autocross.
First find your local BMW CCA chapter, then maybe SCCA autocrosses.
There are some cosmetic mods that I think the ti should have.
Rear ///M spoilers and if you have a M-Technic bumber, a front lower lip.
Maybe eventually change the shift lever.
But slow down on buying stuff.
Save the money for maintanence.
There is a lot you can do yourself.
Throughout the year I buy oil filters, oil, spark plugs, air filters.
I always have enough of the consumables in my basement so when I need to do an Inspection II, I already have the parts. It just makes it easier and seems like I'm not spending as much money.