yeah if it was me i would...
cheapo exhaust system (I paid like $280 for mine including down pipe, later on ended up adding an resonator pilfered off a Mack and a Silverline tip that Ryan Bean gave me for free)
then a cheapo intake (I got my filter from napa, >$35 plus a 4" 45 degree exhaust pipe and a bandsaw to shorten it w/)
then a 6 pos. chip... I got mine from Bean's and I'm very happy with it
Gauges are good to have, but unless you haul crazy weight you should be fine w/ stock injectors.
Then a clutch when your old one goes up
Then dual HPOP's, 530's, big DIIC, headstuds, and a ginormous turbo
stay away from the big names like Banks, Edge, ect... they just don't have it going on for the PSD