what what should I get?

I am tryin to peice together a list of performance parts that I can get for my legacy 4 door 19990. I really don't have much of a list so please add suggestions and give some advice.
Air filter
Muffler
Gas filter
And turbo altthough I have no idea what one.
I Haven't really given much thought as to which brand I want for each on but I am hopin to keep my budget around 1500 bucks.Any advice would be aprreciated(sp?).

My car is a 95 ej22 so it is a little differant, but heres my list so far.

K&N Drop In Filter- ~$40-Cause I havent found an intake I like...

Remove Snorkel Thing- $Free- From what I've heard this does pretty well.

Unorthodox Underdrive Pulleys- ~$200- I have heard varied reviews, but I think I'll take my chances.

SS Cat-back Exhaust from Cobbtuning- $575- A lot of money but you cant beat a bolt on cat-back for sounds and performance.

SS High Flow Cat also from Cobb- $315- Won't get this one for a while..

ECU Chip Upgrade- $??- Don't know how much, but its done by Total Subaru Performance.

Cams- $??- Waiting for Cobb to develope 2.2L Cams...

Then theres suspension...when Im done Ill enjoy the car for a while, then sell it and buy a 2.5RS or newer Legacy 2.5GT

Unless....I go with the Rimmer Supercharger...MMMMMM

Oh yeah, One more thing, I have found that, unfortunatly, a Legacy is not the best car to modify on a budget....