4) Void Salts and (4) Greater or Grand soul gems (have to be filled with greater or grand souls, put one of each in the offering box and there you go! Im sorry this was so long. Omg I married Vilkas, I loved both of them but i just picked one ;-; But I guess your my in game sister-in-law XDD My personal favorites that are one handed weapons are Dawnbreaker and either Blade of Woe (Its after you complete the Dark Brotherhood quest (kinda) if you havent already did im not going to spoil it for you)
Either I would choose (if you want to dual wield)
Dawnbreaker (sword, very effective on the undead)
Blade of Woe (dagger, absorbs 10 points of health)
Mace of Molag Bal (mace, (you have to kill a person to get it, deals 25 damage to Stamina and Magicka, if target dies within 3 seconds, fills a soul gem)
Chillrend (sword, found in Mercer Freys house during the Thieves Guild questline, expert lockpicking or whatever needs to be aqquired or if your good anyways its in a display case, 30 points of damage and chance to paralyze for 2 seconds)
Dragonbane (mostly used for killing dragons, very effective, when your at Sky Haven Temple there should be a room somewhere where its on a table i think left of the wall)
Grimsever (sword)
Nightengale Blade (sword, absorbs 25 points of health and stamina)
Bloodskal Blade is pretty cool, two handed thk)