One thing I did stick with was the level limit for "plus" enchantment of weapons and armor. +2 is the limit for what PCs can craft or buy, but a legendary weapon forged by the gods (or even just "the giants of old") might be +3 or higher.
Again, the game is what you want it to be. For me, opening the doors to some more low-powered magic items isn't really problematic.
Beyond that though I've looked magic items and there's a LOT of caster level 9-10 items that I would want in a world. Bags of holding, flaming swords, carpets of flying, crystal balls. These are all faorly staple fantasy items. I could take the "created by gods" approach but personally I like the idea that mortal hands could potentially make this item, albeit it'd have to be a very high level caster.
Really other than a few spells I don't see why E6 is much better than E8.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.