i used to work at a dealership as a tech and a service writer. from that standpoint i would tell you that you
can resurface them but your best option is to replace them, honestly. if you are planning on tracking the car, why risk it? at best the rotors will overheat quickly (or at least quicker than before) and you'll have to pull off and wait for them to cool. if they don't cool evenly, they'll most likely warp and need to be replaced anyway. i'd just save pennies till you can get these:
DBA 370Z/G37 2-Piece Slotted Front Rotors