I am going to assume you are going to 25ID opposed to USARPAC. (Schofield vs. Shafter)
Schofield Barracks, is located right in town of Wahiawa. When we were deployed 06-08 They tore down the golf course and built all brand new housing, and a lot of it. Housing is also on Wheeler AAF (right across the street) Helemano (up the road like 2 miles maybe) and down towards Tripler AMC there is housing also. With deployment people historically, in at least 25ID, family members clear housing and went back to the mainland.
Alternatively, it was more cost effective for me and my family to live off post. BAH for an E-5 is something like 2k+ IIRC. The duty zip code for Schofield is 96857, you should be able to look that up via DFAS and find out exactly what it is.
Ewa Beach/ Iriqious Point http://iroquoispointislandclub.com
is just down the road and is a great subdivision to live in. Guarded entrances lawn service etc. For a 4 bedroom place I paid 1650/month.
Hawaii is an awesome place for the first year. You get to do and see cool stuff you may have never, nor will ever see again. But island fever starts to set in around, for me, year 4.
Remember though, Mahalo means "Thank You" not "Trash Can".
E-5 with DEPENDENTS:
E-5 without DEPENDENTS: