Since you are only looking to upgrade the stock rotors and pads I highly recommend checking out R1Concepts performance brake parts. They are outstanding quality performance replacement parts and their cost is in most cases close to or better than regular stock replacement brake parts.
For the rotors, since you have such large rims, I recommend their "Premium Series" cross drilled and slotted rotors and Posi Quiet Ceramic pads. The Premium series rotors are the best quality rotors that R1Concepts offers while still being very affordable when compared to comparable products from other companies. The Posi Quiet pads are a low dust, low noise and "Pre-scorched" formula brake pad that will not leave your rims covered in brake dust all the time, will not leave you squealing all over the place and because they are pre-scorched they eliminate the need for a traditional "break-in" period.
When you are ready to replace your brakes, I also recommend fully flushing your power steering and brake fluid to complete the upgrade so that you know that you will receive the absolute best results possible from your new brake upgrade.
When you check out their catalog, click the link in my signature and put the parts you want into your shopping cart, once in the cart enter Promo Code "CK10" to receive the Synthetic Motorsports Forum Member 10% discount. You will also receive free shipping anywhere in the lower 48 states for any order over $99.
Let me know if you have any questions or concerns or need anything at all.