You already have unique swords, so your priority now must be to complete a full unique set. My suggestion is change options later when you have at least 3 pieces of the same type (e.g. sword, armor or accessories of lightning). You will need lots of souls and time to complete one.
Also do not upgrade multiple swords at once. Choose only one and upgrade the sword that you like with the best set of skills that you use to fight enemies. You can transfer the upgrades later.