The main thing you want is something with enough connections for your devices, and enough body so that you are never pulling on wires to separate. Also look for non locking connectors. If it snaps into place it's not made to be removed more than once or twice. If it twists into place it's designed to be removable. Then when you are wiring your connector put your signal wires and power wires on opposite sides of the connector whenever possible, with the grounds between them is actually best.
That military spec connector is the same one JLG uses. Go to any JLG dealer and they can get it for you.
DIY Autotune sells these bulkheads (screw / unscrew type). Probably not enough connectors in just 1, but another option. http://www.diyautotune.com/catalog/weather-pack-22-position-bulkhead-connector-kit-p-364.html
Duetsch makes good automotive connectors. We use em on 90% of the automotive harnesses we build at my company. I think Summit and Jegs sells them.
These, but we get em in bulk for about 1/4 of these prices http://www.summitracing.com/search/?keyword=deutsch connectors&dds=1
Our company is in an old AMP building in Seven Valleys, about 9 miles south of York. Mercury Electronics, we build wire harnesses, cable assemblies, panels.