I sectioned hiked the AT last year from Damascus, VA to Springer Mountain, GA. My base weight was 15.26 pounds and with water and three days of food, my carry weight starting out was 23.76 pounds. It got lighter by 2 pounds every day (food eaten) until re-supply. I don't think you will need that expensive of equipment, but I could have saved weight by switching from a 55 ltr Hyperlite Windrider pack to a 45 ltr pack and switching from a Nemo Hornet 2 Tent to a Zpacs Duplex tent. I'll be happy to send my pack list, with costs, if you would like. I hope this helps.
