Best ways to upgrade a 2K2 I35

[ADJ I35]

I was wondering what are some of the best ways to upgrade my I35 to make it perform better? Personally I feel pretty good about the power, I just don't like the way it handles. But a few simple engine mods wouldn't hurt, anybody have some suggestions on good/smart upgrades? What are some things you've done and enjoyed?

[maxhopper]

For handling you could get coilovers, front strut tower bar, and rear sway bar.

Best bang for the buck on power (in my opinion) is headers.