To save time replace ecto, duel ring and one lob with house teleport. Or if you have it, a house teletab, then you can take more food. Otherwise your inventory looks good. Ahrims would be better than mystic, and other upgrades will be good when you have the cash to invest. Also, you will find a more efficient order of killing the brothers if you can learn to use the meleeing safe spots in the tunnels rather than killing them in the crypts but you will discover this over time. Good luck, I hope you get Guthan's Spear very soon :D