You need to get organized. First state your goal. To me it sounds like you want a V8 Ranger with the 4x4 still functional.
Great. Step 2, figure out your budget. You say you have a ton of money. Is that $3k? Is that $20k? Ok.
Step 3, let's go back and revisit Step 1 and be more specific. With the budget I have I can afford a X motor. I'd really like a Y motor. However, does Y motor come in a 4x4 option or are you going to need custom stuff to make it mate to a tcase? If X doesn't equal Y, you either take the X or save for Y. Simple right?
Step 4, determine HONESTLY what you can do yourself. Are you going to be capable of installing a motor by yourself? Do you have the know-how and the access to the tools to be able to modifying body panels, the frame of the truck, mounts for the engine, mounts for the transmission, etc. by yourself? Again, after figuring this out, you might have to revisit Step 2 because having someone else do custom work is not cheap.
I'm not trying to sound like a dick, but you listed 2 options in your original post (4bt, 5.4L) both of which are full customizations, so it's going to take tons of work to get them operational. Just look at zabeard's 5.4L install.
The tried and true 5.0 swap has the most information and seems to be the easiest to install, but again, it's still going to take some work. Sounds like you really need to just sit down and plan out what you want.
1999 Ranger XLT -- "Project Unknown"
2010 Subaru Impreza -- "The Daily"