What are good rotors for 2010 Mazda 3?
 

I am approaching 46K miles and am thinking of getting the rotors and pads replaced.

What type/brand/grade should I get for maximum life and most importantly, LESS CHANCE OF WARPING!?

Thanks.

Unless you were thinking about upgrading to drilled/slotted rotors and the ones on your car are currently is decent shape - I'd say save some money and just get yours machined, instead of replacing when you replace the pads.

unless you are gonna spend some money on Brembo, stay away from water pools in the roads and check if thickness is right to have them machined

Machined, otherwise Brembo rotors & Akibono pads (OEM brand pads)