Karils is your best bet - if not that, then Black Dragonhide works fine. Use a crush weapon - Saradomin sword is great, as is Zamorakian Spear; I prefer the later - it's cheaper :P Basically you want a good balance of magic/range defence. Take the best food you can. They're pretty strong - so a familiar helps and even so you're bound to do a few bank trips throughout the task. Unless you decide to prayer, which can be costly - in which case, maximse your prayer bonus, and take a lot of prayer pots. Good luck!