George,,,, you're gonna run into that "pump / scuba" dilemma no matter which PCP you buy, it just goes "hand in hand".
As you know, I have a Talon and a Condor and there aren't words to describe how much I love those rifles,,,,, that being said though I would say the Marauder sounds like it might be the best choice for you. Low fill pressure shooting options, magazine fed, all kinds of adjustments you can make on the rifle to tune it to your shooting preferences, quiet as the proverbial "mouse breaking wind" :) ,,, American made, already set up for slings, and judging from the reviews so far seems to be performing up to expectations. Sounds like one heck of a a package for the price..... just my 2 cents......
Jeff