Standard pressures are plenty- it's debatable if the high volume is even necessary, but I usually run one.
There were issues years back with the high pressure units actually snapping the intermediate shafts, which led to higher strength DC/MP shafts with more rounded machining to reduce stress points, etc. etc...
The lack of availability of ANY intermediate shafts right now, let alone any high strength ones; coupled with the lack of need for higher pressures, would make me not recommend a high pressure pump for any build.