you should definately get the slotted only. The cross drilled are great on the track, but they develop tiny stress cracks between the holes that can lead to catastrophic failure. I know a guy with an M5 who had brembo cross drilled rotors on his car and while he was on the track on day the stress cracks caused the rotor to dissinigrate all at once, destroying his fender and wheel and causiing him to spin out.
BMP has some good rotors. Just don'tt go with stock rotors as they will cost you an arm and a leg and will still not be as good for hard driving as the aftermarket ones.
<img src='http://files.unitedbimmer.com/ub.c/RealBmw%2002/Sig_ver2.jpg' border='0' alt='user posted image' />
1970 - 2002
Proud Memeber: 30+ year old car club