For the OP: the best way to approach your future addiction is this:
"Know Thyself"
What blows your skirt up?
Engineering/Fab work?
Risk Adverse or Risk Taker?
Super competitive, love adrenaline?
Prefer a team atmosphere and want to share a car with friends and do LuckyDog endurance racing?
Then, once you know your mental profile, you'll want to address your resource profile:
Room for tow vehicle and trailer?
Discretionary annual spending limit? $5k, $15k, $150k?
Time budget - Weekends free? Have free time to work on the car, prep it etc.?
Once you know what fills your heart with joy combined with how much resources you have to throw at it - then pick the hobby, class and car that allows you to get absolute MOST out of your resources in a sustainable way that allows you to keep doing the thing you love for years to come.