[Hope Springs Hauler]

My gut tells me that with the projected weight of your rig and intended purpose, a "stock" converter would be good.
I am assuming that the rig will weigh about 4k to 4500 and be used for all around wheeling. If it was going to be a dedicated racer, I might bump up the stall speed a little.
Also, don't forget that cam selection plays into this as well. If you choose a radical cam, you will need more stall speed to get into the motors powerband.