well with my 90 LS i started with intake, header, hi-flow cat, and exhaust. then the head gasket went (not due to any mods, the radiator cracked somehow and i drove it too far after it overheated thinking i could run the heater and make sure it had water in it to get home), so i swapped the motor and did some other stuff.
it really all depends on your goals for the car, your budget, and your personal taste.
btw there's a quote button down at the bottom right of every post.
