I have standardised on Anderson connectors for all things 12v (where possible). Unfortunately I still need to use car cigerette lighter plugs and sockets for some connections.
There are a number of 12v connectors available for use.
Anderson Powerpole Connectors
I have chosen the PP Series as a standard 12V DC Power Connector for all operations and installations. The connector ratings adopted are rated at 30A and 75A. They are small, easy to terminate (either by crimping or soldering), and inexpensive. 15A and 45A versions are also available, which mate with the 30A connector while accommodating smaller or larger wire gauges respectively.