SKILLS
Storm Strike (20) and Hammer Throw (20)
Thor has a unique (slot 5) that grants +damage rating on next melee attack after ranged, and a +damage rating on next ranged attack after a melee attack. With your main attack being Storm Strike, and main ranged being Hammer Throw (or you could do Storm Hammer, but it doesn't feel very Thor-like), you can keep that bonus going indefinitely by alternating attacks.
If you don't have that slot 5 unique, go ahead and equip Idol of Khonshu.
Immortal Combat (20)
While half of your damage won't be coming from melee, the +defense and tenacity makes this skill worth the points.
Bring The Thunder (20)
This is your go-to ranged area attack while others are on-cool down. It deals DoT (damage over time), so it can be used as a fire and forget power while running away or dispensing stationary targets. I use this mainly while wailing on mobs and bosses with Storm Strike, thus making the most out of the + damage rating before either a melee and ranged attack.
Asgardian Smite (20)
While some people might not like this skill due to cooldown, I use it because it is very Thor-like. It isn't a bad skill. It deals good enough damage and that damage further increased by Immortal Combat. Use it with Doc Ock medal to increase the area of effect and damage also.
Asgardian Stamina (20)
This passive skill helps a lot with survivability. + health, + health regen + defense and +chance to ignore projectiles keeps Thor alive for much longer, allowing you to strike bosses for extended periods of time.
Thunderous Charge (1)
Just a travel power, but I use it to get in close to enemies to dish out some Storm Strike punishment.
Mjolnir's Flight (1)
Another travel power, I just use it to get around the map quickly.
Godly Valor (10)
This is where I dump the points I won't use elsewhere. Some people use this as the main lightning attack, but the cooldown stops me from doing that. It doesn't cost spirit, adds to your spirit, and does decent damage. Because fo this skill, you can spam Bring The Thunder and Hammer Throw for extended periods of time.\
EQUIPMENT
ARTIFACTS
Power Prism Shard - mainly for increased area of effect and + damage to area powers, of which my Thor build uses a lot.
Advanced Super Solder Serum - increased survivability and health regen
Advanced Phoenix Feather - Thor's thunder attacks all deal energy damage, so this artifact should enhance that
Pym Growth Serum - added health and damage, which isn't bad. I use this instead of the shrinking serum because Thor doesn't really have much use for dodge.
RELIC
Attilan - Like I said, area damage. You can also use Subterranea for def. or the ever popular Lemuria.
URU-FORGED
War Belt - Even though only half of his attacks are energy-based, you can't really equip a single thing that addresses all attacks for hybrid characters.
LEGENDARY
Gungnir or Casket of Ancient Winters - You can't go wrong with the ever popular Gungnir, but if you want to build around your character specifically, you could go with the Casket of Ancient Winters to improve AoE damage and it's in-line with Thor lore.