Looking for a laser printer that can reproduce screens below 5%

I need to purchase a new laserprinter. Much of our work involves documents with screens in the 2-10%range. Our current printers cannot reproduce screens below 5% black andperhaps 8% Reflex or say PMS 185.

These are hard copy proofs for layout and our customers and pressmen need to see reasonably accurate screens.

What are you all using?