Safest way to SPEEEED, what do you recommend? Options

[Hym3n]

I have a '96 ST, and it's just slow. 105hp.. I mean c'mon. On top of that, I think she was mishandled before I owned her (some college chick had her before I did), so she's a little more sluggish than pure-stock, and the wheel shakes at high speeds. I'm going to be getting one helluva big maintenance in about a week though ($700+), and assuming nothing is broken or needs repair, I'll be spending more on stereo, wheels, paint, and of course, speed.

My goal is to safely get to 150-160hp without shortening the life of the engine TOO MUCH. I currently have 65xxx miles, and this car will be my daily driver (I'm 16...) for several years, so I'm not interested in killing her off faster than expected, so it needs to still be reliable until 200k hopefully. If not, what do you think would be the first thing to go?

I'm thinking intake/exhause will give what, a combined total of +20-25? What brands do you suggest, Injen for the intake and GReddy for the exhaust? How about headers? What exactly are they and how much will they help? What other options are there and where can I find them? What brands do you recommend?

Note: I don't want a super/turbo-charger, no nitro, and no engine swaps.. those are pretty much my limits.

Thanks,
-Brian