headlight recommendation for my Duster

One problem with many new production sealed beams is they manufacturers haven't been maintaining the quality.
If you want a good sealed beam, then may be better off with used old stock. (plus relay harness - especially if installing the higher wattage 6014 lamps)
Most halogen sealed beams draw less current on low beam than even the original 6012 lamps. The Nighthawks were an exception. The current production Nighthawk sealed beams are made in China and poor design - not the same as produced 5 years ago.

The Hella "Vision Plus" is probably the least expensive decent halogen lamp available. Use a good quality bulb (not what comes with it). Aim them properly and use a relay harness to power them.

Current Sealed Beam overview from Dan: Sealed Beam Headlights