No we don't really recommend one site... wherever is cheapest
Your list looks good... you'll want a lanyard if you don't already have one but your setup is almost identical to mine, I have a different transmit antenna but you easily have 1.5km or more FPV system there. Your next decisions will be whether or not to move the CAN-BUS up into the body for an internal iOSD mount (most people do, it's better) and transmitter location/orientation which basically determines FPV Tx antenna location (you don't want it near the compass).
Do you have a video or some guide and feel comfortable that you know where everything plugs in?

Your list looks good... you'll want a lanyard if you don't already have one but your setup is almost identical to mine, I have a different transmit antenna but you easily have 1.5km or more FPV system there. Your next decisions will be whether or not to move the CAN-BUS up into the body for an internal iOSD mount (most people do, it's better) and transmitter location/orientation which basically determines FPV Tx antenna location (you don't want it near the compass).
Do you have a video or some guide and feel comfortable that you know where everything plugs in?