I play 2hander. but dual wield sword light armor orc warrior is the absolute king of skyrim (from power gamer perspective due to more inherent passive boosts to damage and being only build which can get and make much use of haste).
dual weild with sword spec. Dual weild is the right side of 1handed. Pretty much in skyrim anything that is a passive bonus or proc is best so dual weild wins because it has the most options for passive bonus. dual weild 1 hand sword gets increase damage 100%, decapitate (insta kill), crit 20%, decrease stamina cost 25%... So thats standard u get those with 2hand 1 hand sheild ect. But with dual weild oh wait u get Another 50% increase to damage, and 35% perma haste. gg there isnt even a haste spell in game (besides haste shout but i dont fu** with those much cuz of cooldown)
so all that stuff + beserk = u win everything
race doesnt matter too much. Nord you will have easier time early game before you are enchanted against casters since everything does cold damage.
Armor doesnt really matter but light armor has better lower passive boost in regen 50% faster stamina vs increase in hand to hand damage and decrease fall damage. You will blow past the soft cap (which is around 550-600 if i remember) which is about 80% dmg reduction with either armors and without using all armor boost perks. So armor is preference on how u wanna look the 50% stamina def wins from power gamer stand point since the final teir (10% evade or 10% return damage) are kinda meh by the time u have access to them u wont take any damage really so not getting hit doesnt matter and nothing melee should really hit u cuz of how fast u tear down.
Armor just comes down to which side of smithing do u want to take Left side is faster and like I said better perks with light armor right side u get better wep creating abilities at the end.
(you can go maces for armor ignore since your gonna have alot of speed boost with dual weild to offset the slow swing) axes are out cuz bleed effect is useless after early mid game since you will kill too fast even on hardest settings.
Assassin would be fun if skyrim displayed hit numbers on screen but since it dont that 1 first kill in a battle being some insano damage is kinda meh since you will 1 hit without the 15X daggers or sneaking anyway. and to me if somone says whats best damage I look at what can train wreck through everything not what can burst a 1 hit.
here is a sample build for dual weild. You absolutly could forgo smithing and enchanting and do nothing with those perks and the game will be way more challenging and fun imo but if u want to play skyrim like diablo 2 go smithing>enchanting>dual weild perks>light armor perks>sword perks
http://www.ign.com/builds/the-elder...000000000000050110003210000000000000000005111