Unless you want a decoration the front strut bar won't yeild any gains for ya. Since the strut towers are so close to the firewall there isn't much flex between them.
Now for keeping the front wheels on the ground motor mounts are a must. The rear dogbone mount will make the driving experience much more controlled and enjoyable. Negates the front to back movement on the motor making your shifts connect faster, the braking better, and acceleration smoother. Bar none the best modification I think I have installed on my car.
Suspension is always good though. Get a good suspension kit and you will love how the car will handle. If you don't have a rear swaybar stock I would recommend getting the Steeda rear swaybar kit. Comes with brackets and a 21mm rear swaybar. That will really firm up the motions of the car.
Though if you really want to keep the wheels on the ground get some good tires. Crappy tires will always give no matter how stiff things are. Get some good sticky rubber and that will be the best improvement for traction and handling all around the car.
Other than that, motor mounts, LSD, focussport front lower bar (keeps wheels planted a bit better around corners), suspension, etc.