Double Experience for each level 60.

[Noxifer]

You have a 50% armory bonus, and 100% for anything below 50 (assuming you have a 60)

I.... really wish people would stop adding that "assuming you have a 60" thing. On my main (C'alih), I have level 60 classes, and get 100% bonus to exp and Fates and such when below 50. On my alts, I don't have any 60 classes, and I still get 100% bonus when not on my highest class (and below level 50). Haven't taken a closer look on one of the alts that don't have any level 50s yet, but will try to remember to do so tomorrow.

As for levelling faster... Keep in mind that if you're in a dungeon where you're synched below 30, you once more get the benefit of the Brand New Ring if you equip it. If you're synched to below 25, and have a Friendship Circlet, you can equip it and get the bonus from it again.

Personally, I'd be alright with a slight increase in the bonus for each level 60 character. Say, 10% or 20% extra for each level 60 character.