re: Ordering my Sea Hunt BX 20 tomorrow. Should I get a jack plate?

You would be fine getting a 6" jackplate on that boat. You would love the hydraulic being able to adjust on the run and stuff. Especially if you get trim tabs as well. I have a 10" JP and tabs on my boat and when in shallow water can raise jackplate all the way up, drop trim tabs down and hop up on plane in a foot of water. Much better than trolling or hoping tide comes in so you can escape. Like I said its one of those things you don't want to spend money on at first but once you have it will always be playing with tuning your boat. They are really a good attribute to a bay boat.