Is the tank drilled? If so you can have an under-the-tank sump/fuge. If not, you'll need to look into some sort of DIY
for an in-tank overflow to sump/fuge - or simply a HOB
If its going to be a FOWLR
and maybe a clam and anemone (which is similar to the 150g we have) -- they only have 3 biowheels, a small skimmer, tons of live rock, and they will occassionally run a micron filter on the water (one of those Magnum 350's).
On the 75g I had, it wasn't drilled so I had a biowheel (with carbon and micron filter in the back of it), a HOB
fuge with a pretty crappy skimmer built in and UV
sterilization. Lighting at the time was all I was really short on. My water was always *crazy* clear.
Good luck to you.