I picked up a kit I got from Vintage Connections, and I think it is superb! I had tried several types of connectors (bullet, spade, etc.) from different shops; however, they were no good, despite the cost. They either wouldn't crimp well, the male/female connectors couldn't be separated, or both. The bullet connectors in the Vintage Connections kit are close to OEM, and the ratcheting crimper comes with a die to fit the connectors.
It's always a good idea to solder connections; however, I like to use a professional quick disconnect type of connector for components that may need to be removed.