I was writing about those quests:
http://wiki.project1999.com/Broom_Of_Trilon_Quest
http://wiki.project1999.com/Shovel_Of_Ponz_Quest
http://wiki.project1999.com/Stein_Of_Ulissa_Quest
http://wiki.project1999.com/Torch_Of_Alna_Quest
As has been said, the torch might be the most important if you solo. In group situations all the other 3 will be usefull depending on situation. The same is true if you don't intend to research the research only pets and you are stuck with just 1 or 2 of them.