if you want it stiffer and no height change I would go for some sway bars, increase the size on the front and back.
you can go and installed some performance shocks also, I have AGXs and they'd be perfect if you don't wanna lower your car. Just turn the dampening all the way up and down when you want a less bumpy ride.
The next step would be to get coil overs, you can make it whatever height you want and have stiffer spring rates. Or if you can find some stock height springs with stiffer spring rates you can go with that. Go single rate also.
http://www.hadesomega.info -car specz and movies 95 Eclipse RS | 76' 280Z | 89' MR2 | 99 Neon | 91 Zephyr Who sez FF can't drift?
