brake upgrades?

i havent had to change any pads or rotors yet but when i do i want to upgrade my braking system. im just wondering if there are any brake kits for the impalas or will i have to get adapter kits as well. how much would this cost me for parts?

I'm thinking about getting thses "BAER_DECELA" from AutoZone.com (http://www.autozone.com/servlet/UiBroker?UseCase=C001&UserAction=performMoreDetail&Parameters=TRUE%7C%7EBRAKE+ROTOR+-+FRONT%7C%7ENONE%7C%7EBAER_DECELA%7C%7EPAIR+++++++ +++++++++%7C%7EFALSE%7C%7EFALSE%7C%7E617875%7C%7E1 947%7C%7E55034-020%7C%7EDECELA+ROTOR+++++++++++++++++++++++++++++ +++++++++++++%0ADRILLED+AND+SLOTTED%7C%7E%24275.99 %7C%7ECHEVROLET%7C%7EIMPALA%7C%7E2003%7C%7E3+MO%7C %7ENONE%7C%7ENONE%7C%7EW)

http://www.3800performance.com

Looking through there, they have brake packages from KVR and higher end pads and such. Don't know if thats what your looking for exactly, and it is definitly pricey.

I find my 'stock' brakes for the police package to be just fine for my driving habbits =D