Newbie looking for the right hardware for unmanned rc boat, flight controller, f405 good?

This is my first ever project with ardupilot/ arduboat, i want to build an auto pilot rc boat.

project requirements:
gps waypoint guidance
telemetry
flight controller below or around 50 euros, the whole fc+ sensors needs to be below 100
override using a r6fg reciever
i already know about the power side except the power needed for the “brains” of the boat, my esc has a 5v bec integrated tho.

do i go for an f405?

I think f405 is enough for what you want do but you will run into its limit of you do something more demanding on it.

which f405 board tho? speedy bee wing or v4/5? mateksys?

Matek. Plenty of different form factors based on your space and needs. The Matek boards are reliable. F405 is cheaper, but the H743 isn’t often a big leap up in price so might be worth it if you ever decide you want to do scripting or anything custom.

The H7 based TBS Lucid is a great choice for very little added budget.

i bought a corewing f405 v2 and man i really should have looked at the supported firmware cause the corewing does not have an ufficial ardurover firmware…