Sounds real good, that should serve you for quite a long time with such a well thought out configuration.
"No raw water issues yet. I've rebuilt the Sherewood 1716 to the tune of $200 so far and keep up with impeller changes"
Perhaps consider Tony Athens produced replacement water pumps the next time you are in need - they are quite superior to the stock pumps as we have installed more than a few out here. You can find much more good info on the 6b's at his site as well at sbmar(dot)com.
Hope this helps