Learn from my mistakes. I have the same tank dimensions. I bought into the Maxie Jet upgrade and I hated it. The water was too turbulent and I had everything a mess. So I went and bought me and extra Maxie jet, and two Koralia #1.
So, in my set up, I have two #1 and two Maxie Jets 900 in the back facing eachother but slightly upwards, then the two Koralias one on each side facing the front middle of the glass. My rear power heads are on a timer that only keeps them on during day light hours and mimicks a wave like effect to ensure I do not overflow my tank during night time sleep for the fish and corals that close when the lights go out.
Depending on your rock layout and how much liverock you got, I will suggest two #2, and maybe one Maxie jet in the back so that you do not neglect flow behind the rocks.
Now remember that gunk build up on the sandbed will happen regardless of flow but to a small degree which is where your critters come in handy to help clean it out. I use two conchs to eat the deitrus as well as numerous red scarlet hermit crabs.