Hi Tom; and Welcome!!

Looks to me that during your couple of years of reviewing these posts, that you've also done a lot of homework and planning!

Also sounds to me that you've picked all the right stuff for all the right reasons within the constraints of financing and WAF

Seems you've got the system nailed except for the sub question.

Yeah...that may be a lot of volume to fill with just one EP500, and I know I'm being pretty free with Your money; but it seems on the surface that one 500 today and maybe a second one sometime later may be the final solution

Hey....two(relatively)easy to hide 500s may well equal one(relatively)obtrusive 600 and still get you what you're looking for in the long run!!