Guthan's is great, but in relation to maximizing slayer expertise rate, I'd opt for a whip. Spend your remaining income on food (tuna if you are ranging, monkfish in case melee), super sets and adequate bolts- mithril are most likely the best until you're able to get your hands on broads.
Consider kitting out your POH with a prayer altar/mounted glory, Kharyll/Falador teleports, and a menagerie. This way, whilst teleporting into your home to visit Sumona, you can fully restore prayer, summoning, and have access to a range of telep...
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