Hi,
For most street applications, drilled rotors are the only upgrade I would even consider, and probably only for asthetic value. Slotted rotors do increase performance, but at the expense of pad life. Not a little, but a lot. Also, drilled rotors are generally thought to be more prone to developing cracks. Porsche combats this by actually casting the holes into their rotors.
I guess I'm curious why you want to change the rotors. If you want more braking power and less fade, a 302mm brake kit from IPD, (uses stock rotors) would probably do the trick, except you have to be carefull about which wheels you're using.

Mark