SO Vp-44 is the way to go by far. Many will try to push you to the monster but its claims are just that ...Claims. The pump is much more expensive, much less reliable and the power claims are not what originally thought.

The SO pumps will produce the most power, their also the most reliable!
Most folks retail the pump from $1100-1300

 

check out blue chip diesel his pumps are pricey But worth it he uses all new internals and electronics. I have a few of his pumps and never had a issue.