I don't see the need for full hydro. I just did the hydro assist with the stock pump on my '89 and it is more than sufficient with 37's. I wouldn't think you would need to run full hydro unless you are turning really wide 40"+ tires.
To each his own, I just finished full-hydro on my rig yesterday. I said the same thing about dual cases years ago. Until I drove a rig with a dual ultimate set up. The next week I bought the second case.
When I first did my hydro assist it worked great with the stock pump modified a bit. A guy I know told me to get a TC type pump. I told him why, the stock one works fine. About a year later my stock pump went out so I bit the bullet and bought a PSC TC style pump. My ram assist went from working great to working amazingly!!!