Yeah I know 400 isn't high but il eventually push up to 650 or more

Another option and one I wish they had when I bought my LP is a mechanical LP like this:

Glacier Diesel Power - Product List

What are the pros of a mechanical over electronic?

The fass system will support all the hp a vp will make. I don't know much on the belt driven pumps but looking at the one posted they don't come with added filtration. I like being able to filter the fuel down to small microns. I worry about belts myself

Would definately choose fass or airdog before anything else, because of the extra filtration.Could hear a change in the way my engine ran when I installed my Airdog.