Ozone 5, yo. I have a cracked version, but I’m not so sure it could be done again, they’ve probably upped their game since four or five years ago. I could spend tens of thousands of dollars on plug-ins. They’re better than “gear”, in the hardware sense, imho.
I have spent prolly $10k on plugins. Including, I think, Ozone 7. Haven't gone 8 yet. Problem with Ozone is it's... aggressive. If you don't know what you're doing you crush the dynamic range into grape jelly. As far as I'm concerned, though, the cool stuff out of Izotope is the creative plugins. Iris is basically a Korg Wavestation from hell: Stutter Edit is... well, it's stutter edit: And Trash is the most fun distortion plugin I've ever played with and I have more than a few.
I can recommend the Sonnox Elite Oxford Limiter, it was always the last thing on my master track. Mannnnnn I can’t wait to get back into producing.