727 or 904?

WHAT..don't have anywhere near that in mine..$500.00 plus the full manual valve body..you can keep the 727's..

And if I built it for you, you would have. When you are responsible to spend thousands of dollars of others' money, your experience and choices will evolve. You're have not as yet made enough steam to break what you built. It's that simple.
Nothing wrong with what you've done - for you. It might very well be more than enough for many.