retaliator has a point, the honda guys might allow you to fit non genuine parts but they'll probably not guarantee the paint then.
honestly i think you've better off either going all out and getting everythign from honda and having peace of mind or getting aftermarket (taiwani) bumpers and getting them painted by a 3rd party painter and saving alot of money in case anything goes wrong with the paint.
choice is yours. but do try getting taiwani bumpers and having honda paint them (with guarantee) as that is the best of both worlds.