From what i can gather the original Black CPS that our trucks came out with are no longer available, except if you can sniff one out on Fleabay that has been either pulled out of a truck, or someone has sold their truck and purchased a new truck and they had a spare in the glove compartment and it's now for sale.
The original CPS (black) Ford part # F7TZ-12K073A had a problem with stalling, so Ford recalled it and replaced it with the Grey one , which in my option is useless.
The Elchins CPS (Nick Mod) is a good choice but you have to follow Nick's procedure in the fitment of it and make sure you've got plenty of ferrite-chokes and cans of beer on hand.
After it's fitted properly you'll be happy with the results.
Note: HID lights will have some interference with the Elchins CPS so fit ferrite chokes on the harness to your lights as well.
Other than that the Dark Blue Ford CPS is your best option for idling and fuel mileage.
Here's what the original one (black) looked like.