Rick,
No, I am not looking at that booster pump, I am looking at a commercial booster. It is the same concept though. In the Industry, we call it a "scavenge" system. You can't fill to required pressure all at once from atmosphere, but you can in steps. What I am planning to do is a series of scavenges with a series of tanks until I get to 3000+ psi. I am looking to buy a 25:1 booster with a 6000 psi High pressure rating.
The booster example that you listed may be a pretty economical option though. It is fairly inexpensive compared to the commercial boosters.