The thing is if I remember correctly, OF Thor JMS only had a portion of the Odin Force according to Strange when he fixed the hammer and not all of it.
That being said the Power Gem/Norn Stones are a crazy item to give out to someone with any decent portion of the OF.
It's hard for me to really think how much of an amp Thor will get with all that if he is using everything he has to it's fullest abilities.
If he is really tapping into the power gem and combining that with the OF he had and the Norn Stones he could be pretty beastly depending on how much power you think he can amp with from the power gem.
So I don't know where he gets to.
Sans all of his gear and items I would think JMS Thor would probably stop at Zeus. If you think he had a decent portion of the OF he may make it to Galactus but would stop there.
With all this stuff on him though I don't know where he lands.