cudaeh

hey guys,
I have a slightly modded 2000 2.5rs
mods:
intake
catless 'track' pipe
borla header
wrx exhaust
blended polished and coolent diverted TB
portmatched intake, and heads
under drive pully
I was wondering... I have done slight upgrades to almost every aspect of this car so far (visual and suspension not listed above) except for my ignition and fuel manigment systems so far.
I plan on finding a way to get my computer tuned but before that i wonder if i should upgrade my fuel injectors, rails, lines, or pump?
I plan to re-do the heads next summer (stiffer sprins, stronger retainers, multi angle valves, and a hotter cam)
I have no clue other than basics volume pressure ect how fuel componets work.
for example
at what point sould i upgrade my injectors?
will fule rails realy make a diffrence (other than looks)?
Do upgraded fuel pumps do any thing for me other than cost money?
please post any info you have. I am a compleet noob at fuel systems.
I have tried the surch option but have come up with alot of wrx info but no N/A rs info.