Hold off on the uper strut tower brace...you'll see little improvement on the handling/dollar ratio.
Have you considered going with Ford Racing instead of the koni/omni combo?
Then go here and give them a call for prices
That way you are getting fresh springs (about 1.5" lower than stock but still plenty of clearance) and matching shocks. Should be about $340 shipped too. Just another choice for you to ponder.
For your sway bar since you dont have one, you will need Steeda's mounting kit/sway bar combo.