There is no truth to using inter-rootstock from sour fruit diminishing the character of fruits grafted to it. If that were so, then almost all sweet fruit would have diminished character, because they are all grafted on to a sour rootstock.

What is your favorite citrus? Whichever you think is the best-tasting is what I would recommend planting. You can graft others to it eventually.

thanks JB for the input.

your comment makes sense, I sometimes have "cant see the trees through the forest" syndrom set in (also known as "head wedged firmly" syndrom). I'm going today to pick up a citrus tree and probably a passionfruit vine. I'll decide which flavor when I get there,

thanks again,
-Ethan

There is a member from the CA Forum who does a lot of grafting of fruit trees. Look for Joereal and try to contact him for more info on this subject.