Amy, good to see you are out hiking and looking for information to help you out. You only need ankle support if you are carrying more weight then necessary. Lighter loads don’t need heavy boots. I would take a hard look at what you are carrying and see what you can leave home. That’s a place to start. I would also suggest you read about how to lighten up, here are some of my favorite books:
• Lightweight Backpacking & Camping: A Field Guide to Wilderness Hiking Equipment, Technique, and Style. Its on sale on this website http://www.backpackinglight.com/cgi-bin/backpackinglight/00070.html
• Lighten Up, also for sale at this website http://www.backpackinglight.com/cgi-bin/backpackinglight/lighten_up_book.html
• The Backpacker's Handbook, by Chris Townsend http://www.amazon.com/Backpackers-Handbook-Chris-Townsend/dp/0071423206
I found all of these at the local library and read them before finding this site. Start with "lighten up". It’s a short, quick read with great information. Then read the others for a more in depth study.
Your question about shoes/boots is covered in all of the above books.
BTW, do you or your husband work for www.staphaseptic.com or Tec Labs? You first post screams of self promotion.