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My understanding; Current metallurgy makes cross drilling unnecessary. Back in the day, cross drilling helped to keep rotors from warping and cooler. But cross drilling and slots also give gases, that are generated under heavy braking, an escape route. They also help in wet weather driving.
Nothing wrong with switching to change the look either. Make sure the drilled rotors are for your car. Some of the drilled are specifically for the S's and won't fit on a base. Verify the diameters.
+1 BWDZ's suggestion that you bed the new pads to the new rotors. Take the time to do it, I think you will be surprised what a difference it makes. If you buy 'sporty' pads, the manufacturer will have the procedure available.
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