Molex is the way to go. We have used them since 2004 and I don't think we have had any failures. Quick disconnect and very water resistant.
www.molex.com MX150 series are available in 4,6,8,12, 16, & 20 conductors. 14 - 22 gauge wire. You do have to buy their male and female tool $$$$. They are a little expensive but you get what you pay for. Here is the data sheet:
http://www.molex.com/catalog/pdf/MX33472.pdf
I purchased from:
http://www.heilind.com
Here are some part numbers that we used too:
SAE Wire, Dual Row Receptacle 33472-1601
SAE Wire, Dual Row Plug 33482-1601
Extractor Tool 63813-1500
Manual Crimp Hand Tool 64016-0025
They need the male and female pins too. I don't have the part number handy.