There is nothing wrong with using the 12v cigarette style outlet, other than sometimes they will rattle loose. as for Anderson connectors and misc stuff, if I cant get it from work I order through http://www.powerwerx.com/ They have pretty good pricing and the customer service is great.
All of the alternative connectors are good, solid plugs but I guess the electrical gremlins have spared me. I've never had the problem of a loose connection with the stock ARB fridge plug and the 12V connection in the bed of my truck in the last 5+ years. I have had problems with some of the male plugs for other devices but I swapped those out for Blue Sea replacement plugs. I really think it depends on the quality of the connectors.