depends on what you mean by "upgraded" rotors. Slots and x-drills will offer little (slots) to no (xdrilled) benefit over OEM. Rotors are a wear item.

however, if your rotors are warped or otherwise damaged (cracked, etc) it'll be a good idea to change them. If they look like they're true, and are in decent shape, get em turned (resurfaced), since last i checked it was much cheaper to do that then buy new rotors ($8 for turning, $16 for rotors).