Hi Corey, welcome!
I garden on almost pure sand, at least it seems so. I do very little amending, and lilies do very, very well for me here. I'm 6a also.
I have no trouble growing the orientals, so don't count them out just because you're sandy. They normally don't last as many years here as the others do, though they last quite awhile.
You sure have gone lily crazy, and you're in good company. We have some true experts on here, and they can help with any questions you have.
Glad to have you here.
