I've found the Eibach's to be a great spring for competitive racing. The drop is just enough to get rid of the monster truck look too. I don't know the rates of the stock springs, but the Eibachs are:
Front: Progressive; 171#-234#
Rear: Progressive; 87#-143#
(Thanks to mfuller for this info)
You will be fine with 18's, as long as you keep the right diameter. With 18's you should get 225-40-18's, with 17's you should get 225-45-17's. You can go to 235's and you will still be fine also.
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