When doing your wiring clean up I would still go out and get a soldering gun or iron. The connectors you are looking into are nice, but when putting a 1" hard plastic connector close to the ecm, I have found It really makes for a big ugly harness as those are bulky and if you have to make a quick turn with the wire can also cause issues.
A simple hook solder and a small amount of heat shrink will not act much different than a regular uncut wire and will look nice buttoned up in nice tight harness.
Also its much cheaper to buy solder and heat shrink. Just my 
I second this. When I discovered heat shrink it made me look like an instant pro. Won't pull out or vibrate loose either.
