Welcome to AF!
All rotors will warp but yes Grand Ams do tend to warp more frequently.
Their are quiet a few rotors out there besides GM stockers.
Heres a thread dedicated to GA parts & performance.
http://www.automotiveforums.com/vbul...d.php?t=502706
I personally think, right now, Power Slots are the best out there for the price.
They are cast with the slots so they arnt heated like other rotors that are cut in slots.
PS even hav cryo-rotors
suposedly they are even more warp resistance, but unless your rich, you probly dont want those for street.
heres
powerslots home page
They hav them at
Parts For Your Car site
Good Hunting!