Where's the poll?
I'm considering it. Option #3 (Option #1 is RAW) is that all the Big 3 of 4E each derive their power from the level of the wielder. If you're 4th level, it's a +1 item. Once you hit 6th level, it acts like a +2 item. Etc. If there are additional powers they may only activate once you're sufficient level, so that a "Holy Avenger" does not have the listed powers when you're 12th level, but rather something of the same them but level appropriate. Maybe a Ritual will unlock it once you're high enough level.