I ahve 37k miles and on the original rotors and now have burned through my second set of pads. The replacements were under warranty but the new set will be on me.

Wondering: Do I go with the oem pads again and then have to change them every frikking 18k miles? I do not want to replace the rotors if I don't have to, but if they are shot, I would want to consider aftermarket's as well.

I do not want to sacrifice any brake performance and certainly don't want to spend more than the dealer would already charge.

Advice?