Yeah, they are currently on sale, but for sonogram editing I would apparently need at least RX Standard.In terms of Spectral tools, Izotope RX is much more evolved than any you mentioned.
Yes, it's pricey, but the implementation and restoration tools are significant. If you are doing that type of work, it's likely worth the investment.
Having just finally upgraded from Logic 9 to Logic X a month ago ($200), plus getting massively discounted Helix Native as well (as a Line 6 HX Stomp owner for just $70), buying RX for $300 is already over my budget since audio editiing is not even my main occupation.
And if I want to move to Catalina full time, I'll have to spend another few hundreds of CHF for a new 8-channel audio interface as well, since my trusty "old" Alesis iO26 Firewire won't do a beep on Catalina either. Oh well.
But thanks for the heads up anyway: I might actually get RX Elements since its just $30 at the moment. I'm a long time user of ClickRepair & DeNoise, but its future appears to be rather uncertain as well at the moment: https://clickrepair.net