hi im a bit of a newb and was wonderin at what lvl should my hammerdin trade in my full sigons set for something better... the set was givin to me free and its been serving me well so far... by the way im at lvl 23 at the moment. thanx all.
Uber gear for a Palladin would be Shako, Mara's or Rare Ammy, Enigma Armor, HotO, HoZ, Wizzy, etc. There really isn't a level requirement. It depends on the speed at which you will be able to get your gear. But seeing that you're new, it might take a while. I strongly suggest you to not worry about things such as these, and focus yourself more into playing the game and learning about trade values, MF'ing spots. It'll help you a lot.
I doubt that you will get anything valuable for Sigon's Set, but I have to admit that it's a great set to use at the beginning of your hammerdin's life.
One thing, If I were you, I wouldn't trade that sigon's set just yet. Like Zerokid said, you wont probably get much for it but on the other hand you can keep it and use it again when you start another character. Imo, this set is probably the best low level set of the game and some pieces of it can be use virtually though out the game.
use gloves, belt, boots in normal and nightmare (maybe shield too) sell the rest if you get better stuff or if you come to late nightmare.
Try to get a "rhyme"-runeword (sheal-eth) shield instead of sigons in nightmare.