Once you own a ratcheting Molex crimper, you will be amazed at how quick and easy it is to crimp your own Molex connectors. Burnt GI connector? No problem. Want to shorten the wires on a purchased mod? Easy.
Buy one of the DK Pinball power splitters and plug all your mods into that. If all/most of your mods originate in the backbox, mount the power splitter in the backbox.