New pads if you are changing rotors.
I'd do a full all around rotor and pad change, get some hawk HPS and stock rotors if you want to save a bit of cash but have some nice bite. These motha's will squeal like a bitch if you don't antisqueal them.
While your at it, bleed your brakes (or better: powerbleed them and change the fluid entirely) if you havn't done so in the last 50,000 miles. to remove the spongey-ness that tends to build up over time and after spirited driving. Rotor upgrades are great, but can cost some cash since you'l need new calipers and junk if you get a larger size. (however, if you just get crossdrilled\slotted at OEM size, it's all good)
Remember, if you change your pads yourself, you need to bed them in. Most mechanics do this for you so you don't go hauling ass to a stoplight and wonder why your brakes wen't hardly working after a semi T-bones you...
Rotors: You'll be fine wtih OEM, even with some spirited pads like hawk HPS. If you want a little more protection from fade and glazing you can go crossdrilled. Whatever you get, make sure your rotors are vented otherwise the heat will just build up and build up and build up...