For the most ease of choosing and making future changes, I think BCB and our WH Sherman Tanks offer the simplest and possibly the least expensive upgrade if you decide to go with an internal pump later.
External pumps are still a legit option, and don't care which tank you use (including stock) but since it sounds like you'd like the added capacity of a new tank as well(?) I would say one of those choices is the best.
I'm biased of course. But that doesn't mean it's not true.
With this tank, you purchase the standard tank for now, then add the fuel pump kit later.
Return lines can be set up immediately, or not, as they can benefit even a carbureted vehicle. Some EB's actually came with return lines from Ford. Typically the high-altitude or high temp rigs such as you'd find in Colorado or AZ. Should help off-road too, with bouncing around changing the effective pressure at the needle-n-seat of a carburetor.
So you can plumb the lines now, and still use them later with the EFI.
The return lines don't care as much, but the pressure side lines should be high-pressure EFI rated lines no matter what. Won't hurt anything with the carburetor, and you don't have to do it over again when you add the EFI.
The Command Center is certainly there to simplify the entire plumbing thing. It's supplied by the standard pump on the engine then steps up the pressure with it's internal electric pump. The "return" system is internal.
The only downside to this that I know of is it's lack of happy campers when used off-road. Doesn't seem to like all the bouncing and odd angles and I don't think anyone has found a 100% cure yet.
Not a big deal for most newer EB owners as they may never see any off-road action. But it's certainly worth bringing up here for discussion.
Paul