Not necessarily in exact order, but below are my top ten favorite inversions:
Wildfire's Stall - This is the gold standard for which every other stall is measured against. It is absolutely perfect.
Untamed's double inverting stall - One of the wildest inversions ever conceived. I still don't know how to describe it, but I loved it.
VelociCoaster's inline twist - I won't call it by its stupid, gimmicky, marketing name, but the inversion is incredible. No other inversion tries as hard to toss you out.
Iron Gwazi's death roll - Nothing like getting tossed out of your seat before getting ripped through this downward twist. It makes the first drops of Storm Chaser, Medusa Steel, and Twister Timbers look pedestrian.
Mr. Freeze's top hat - I still find this to be one of the all-time greats. Vertical up, quick twist into the top half of a loop, quick twist out into a vertical drop. Well ahead of its time.
Hyperion's dive loop - You get tossed out of your seat and then dive down an enormous drop while ducking under several structural members. Fantastic.
Zadra's wraparound dive loop thingy - For all of the inversions that have stupid, unique names, I don't understand how this one doesn't have its own moniker. You do the odd jaunt to the left going up into it, twist upside-down, and then do a semi-diving pullout through the structure of the first turn/hill. It is a masterpiece.
Storm Runner's flying snake dive - Ejector air into a zero-g roll followed by a half zero-g into a diving corkscrew thing. There's nothing not to love.
Wicked Cyclone's stall - This is what Steel Vengeance's stall is measured against and it falls short. One of the greatest inversions I've experienced. While I prefer the longer, drawn out stalls (see Wildfire), this one is perfect for the shorter side. Wild, intense, but doesn't have the overly aggressive snap that SV has.
Cannibal's dive loop - Pretty much regardless of where you sit, you are getting ejected out of your seat right as you start the dive. The lagoon roll got all the thunder, but this is by far the superior inversion.
Honorable mentions:
Manta's pretzel loop (not Superman, not Tatsu, but Manta)
Tennessee Tornado's first loop
Lech Coaster's inline twistscrew thing through the station
Kumba's zero-g roll