Turned rotors are OK unless you go below the recommended minimum thickess.
Its getting them turned TRUE that is the big problem with turned rotors.

You actually want to scuff the turned surface slightly to ensure that the
new brake pads are correctly bedded.

 

there is no performance braking difference between the powerslot rotor or the original gt rotor. Just buy take off gt rotors and have them machined. You can paint them black and then have them machined and they will work good just use heat paint. Doing the calipers with heat paint will look good too. There is really no point on waisting so much cash on powerslots or any other bs rotor with drilled or slotted. Yeah it looks cool but it doesn't do anything. It's like putting 24's on a mustang yeah it looked cool but whats the point. Plus if your into peracing think how much cheaper it is to just get take off gt rotors and have them machined.