Dispel scrolls were viewed by some as essential in 7th edition tournaments and even though 8th edition Warhammer rules limit you to one, it seems that the humble scroll hasn't lost it's appeal in Fantasy Battles.
Here are the magic items* ranked in descending order of % of members voting for that item.* from the 8th edition Rulebook only, not the magic items in the army books
The best Magic Items in the 8th Edition WFB Rulebook
10% ¦ Crown of Command - pippin_nl
8% ¦ Fozzrik's Folding Fortress- Eternal Knight
8% ¦ Ironcurse Icon - Painted by G
7% ¦ The Terrifying Mask of Eee! - Mosk
6% ¦ Talisman of Preservation - whitewolf14
6% ¦ Dragonbane Gem - Telepfenion
5% ¦ Sivejir's Hex Scroll - Coinsmith1
5% ¦ Banner of Eternal Flame - teclis
4% ¦ Arabyan Carpet - Tomsche
4% ¦ Sword of Swift Slaying - strigoi
3% ¦ Potion of Foolhardiness - Kefka
3% ¦ Earthing Rod - Grim Squeaker
3% ¦ Standard of Discipline - Nithavela
3% ¦ Forbidden Rod - Drummyralf
3% ¦ Wailing Banner - Baelspar
3% ¦ Tormentor Sword - aaron88
2% ¦ Armour of Destiny - Noble Korhedron
Miniature is an old Talisman Wizard painted by Mr Saturday, one of the Battle Reporter forum members.