I've been playing Commander pretty frequently over the last few months and I've built a lot of different decks of varying power levels, some are over 9000 and others are more casual. My playgroups aren't very competitive/experienced so I've never been able to play against tuned, powerful decks. From what I've read there are a handful Tier 1 Commanders- Azami, Sharuum, Zur, Azusa, Jhoira, Arcum, and maybe Scion. Then there are quite a few slower but equally formidable Tier 2 Commanders like Skithyrix and Uril. I've only played with Azusa and Skittles but they feel roughly equal to me.

What other legendary creatures should be on my radar? Are all these Commanders equally powerful or is there one that's truly broken?