I can check something off my list! I ordered my dress today with the help of my Mom, FMIL, Sister, and FSIL. It's Maggie Sottero Tristan in Diamond White & Pewter. 
http://www.maggiesottero.com/dress.aspx?keywordText=tris&keywordType=any&page=0&pageSize=15&style=V7060
It feels soooo good to have gotten this done.