Want to make my own wire harness for add-ons. Need a wire source. Any ideas?

Okay, so here is the deal.... on my 2010 Ranger 800 XP/LE, I added a number of electrical items - dual batteries with isolator, winch, driving lights, back-up lights, under-the-seat fan, horn, turn signals, you get the idea. I didn't ever look at those add-ons as one big project. I would cruise the forums, find ideas I liked over long periods of time, and run each circuit individually - meaning over time there was a lot of duplicity of labor.

Now I have a new Crew and already know I am going to be adding most of the above to this unit a well. I want to approach this one a little differently - with an eye towards laying out much of the wiring for the different installs out all at once.... sort of making my own wiring harness. That way my first project can be making one or two major pre-wire runs and "dead-ending" the wiring until I decide to start on a particular project. Then I can just install one at a time as funding permits.

I will start with the main fuse block and associated wiring. But from there, I want to be able to identify wiring for any given add-on by color code. So I am looking for a reasonably priced place to purchase bulk, quality automotive wire, preferably with colored tracers, along with high quality crimp connectors and such. So if you have a good source, would really appreciate the info.

Also, any of you that have any suggestions relative to making my own "pre-wire harness" of sorts, any and all input, suggestions, or considerations would likewise be very much appreciated. Thanks in advance. Bill