Mjolnir
Oan Power Ring
Cosmic Cube
Nega Bands
T-Spheres
Sword of Power
Quantum Bands
Ultimate Nullifier
Infinity Gauntlet (fully assembled)
Emerald Eye
Moonstone
Spear of Destiny
I'd put the Ultimate Nullifier above the Cube, personally. The Cubes are far more versatile, but there's multiple of them, and the UN is a trump card even against stuff more powerful than a Cube.
I'd also put the Quantum Bands above the Nega Bands (GL-esque powers vs strength, space flight, energy blasting and location swapping?). Heck that one's even explicit- Phyla ditched her Nega-bands for the Quantum Bands.
I am in your algorithm learning all your mannerisms
I'm already level with God
A million words a second and I know your imperfections, baby
I'm the only future you've got
Speak in diatonics, motivation diabolic
I'm like a religion, better locked in a box
Picture perfect image, more powerful every minute, baby
I am everything that you're not
I'd put the Eye above the Ring. It's an almost-unique (two of 'em) magic artifact that can do about as much as a ring, grants immortality, and made the user a pretty nasty Legion foe so I'd say it has more raw power. It can even drain rings.
Not far above, though. They're pretty close.
I agree with the rest of your rankings completely.
T-spheres are the lowest things here, they're just devices that Mr. Terrific can replace as needed...
The Eye can do all kinds of crazy stuff though, pretty much whatever the user wants. Energy blasts strong enough to hurt Kryptonians and Daxamites, mind control, force fields... the Emerald Empress is pretty crazy-strong.