Cuirass of the Saviors hide would be pretty cool, along with the Dagger of Symanchus(if I spelled that right lol). Lords Mail and the Deadric Crescent

i would like this. and i dont just want the typical 15 fire damage stuff, i want big stuff that has some drawbacks too

I think that "Legendary" weapons are a great addition to the game. For them to be legendary I think you need to things:
(1) they need to be epically powerful (not necessarily unstoppable); and
(2) they need to look different (and better) than average looking weapons (a perfect example is the daedric crescent--total paradigm shift from any other weapon)

Another neat addition might be the NPCs having a reaction to you sporting the legendary weapon (could be a bad reaction if the weapon is associated w/ evil)

It would be good if these were not too easy to get--i.e. I should be sporting (at best) a daedric blade well into the end game before I am able to get a legendary weapon

What ever weapon used killing Aldun will be legendary.
Bring him down to 1hp and use wooden stick.

I want the http://www.youtube.com/watch?v=e9GZlHmru_8&feature=player_detailpage#t=183s from Rise of the Triad. XD

Edit: And a hammer similar to Mjolnir.