Oh yeah, you can buy the extended warrenty later down the road but you'll end up paying more as well. Plus I believe buying the extended warrenty later will not include a lot of the available services when buying it at the time of purchasing the car.
BTW, check this guys 03' Accord V6 with the FP package and 17in Honda factory gun-metal wheels.
www.cardomain.com/7thgen6spd