Hey man, theres plenty to choose from, anything Deadric or Ebony will do if your going for Damage, smith and enchant those and you'll do fine, theres a few unique ones aswell.
Infact, one you should definately get is the longhammer called "Volendrung" - Deadric Longhammer/Warhammer? from the quest called "The Cursed Tribe" - check on skyrim wiki - either UESP or the other one for the quest and how to start it.
The Volendrung has high damage and absorbs stamina with every attack, so you'll get to attack more with it (which is great for those stamina depleting power attacks cause you'll get it right back!) Easy quest to do, only involves killing a few giants.
Ebony Blade - a deadric artifact u can recieve from a quest in dragonsreach about baalgruf's children (u gotta go to the whiterun inn and ask for rumours as soon as uve become thane of whiterun) then the innkeeper should say somate about the jarls children and then u go speak to him and start the deadric quest. Its basically a two handed blade that attacks fast and absorbs hp, the more ppl you kill with it, the stronger the absorb becomes, worth searching for in the skyrim wikia. Though be careful its damage is based off the one handed perks, so it might not be useful for you - it levels two handed I think.
Theres also The Rueful Axe - another deadric artifact, though its not that great, it looks cool, damage wise its probably no better than Steel.