After market will be fine. It will not void warranty. Try calling a store selling car stereos, they might be able to suggest a place.
Also try talking to your Honda Dealer see if they can do a better price. Ask the Dealer what brand they use. Have a chat to Honda Service Department as well, they might be able to guide you.
Rear Parking sensors are quite handy. It's not the best car for rear visibility when reversing.
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