There are too many options. I dont really care about sumping a tank. I just want what will support 800-1000hp and dont need to worry about it. It seems like externals are cheaper due to not buying a fuel hat.
When you go return(no matter if you use external pumps or intank pumps) you no longer need the FPDM(you can toss that away).
You can see the large power wire in my engine bay picture, that is power wire running to my trunk for the fuel pumps. You just wire up your new intank or external pumps with relays and bypass the FPDM all together. Its very very easy.
The sumped tank I bought from Glenns is $460 now. I can run it to almost empty with no fuel slosh or problems, its working great thus far.