All of those seem pretty cool to me. Relatively balanced. Nice to see a Rare-level item boost Item Chance as well. If I wanted to be irritatingly nit-picky, I would point out that all individual, non-support Rare items scale with level. Maybe +100 Random Damage Type (+2 per Level) or some such thing? Doing so would weaken it to start, but scale it up dramatically at later levels.