Nice hatch, welcome! The led tails can be pretty expensive, but the fit is universal on all 1st gen 3s. You might get lucky at your local salvage yard though, who knows! HIDs are inexpensive, try to get the ones that are internally sealed with rubber, they last forever, or atleast a lifetime warranty. I'm on my second set and they've been fine for over a year...
Cold air intake is a pretty cheap mod and coupled with a catback exhaust you'll get a better sound and a little kick to hp. Look around the site for ideas, I'll keep an eye out for you when I'm in E. TN