Here is a link to some of the Anderson Power Connectors we have used. You can order new pins (contacts) and reuse the cases on wires no longer being used to help offset costs for future builds.
The
crimper that we use for these connectors is a great one.
You can also connect the blocks in such a way that they only fit in one orientation instead of using different color cases. This eliminates the "need" for stocking different color cases.