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i have seen nittos on c5 wheels in the size that are on a lightning, but they are really large. i think for an 18 inch, there arent many choices.
you can get a 17 inch et street now, maybe you can pick up a set of front wheels and put them on the back (dont flame me, i am just thinking outloud...dont know if the 17's from the front will fit the back).
You want a set of BFGoodrich g-Force T/A drag radials in size 295/35R18 which will fit on your stock rear wheels and match the overall diameter of your stock 274/45R18 tires. These tires are super-sticky and have no tread in the center 3/5ths of the tire and only have a strip of tread on the inside and outside edges. For all practical purposes, they're slicks.