We need pictures of your front rotors.
If the steering wheel does not shimmy or the brake pedal does not pulsate during braking, the rotors are not warped. If you can still see the slots on both front and back, the rotors are thick enough.
Make sure you torque all lugs nuts with a proper torque wrench to 111 or 115 Ft Lbs so the rotors do not warp after brake service; no impact wrench.
Which pads were you told only last 6-8 months??
Go with the Z26s on all four corners. The 26s have clip on noise shims where the 23s have adhesive shims. See my other posts on removing the paint on the sides of all friction pucks and where to lubricate the new pads.