From personal experience the SX-4 and Golden Ring HD spotter are similar in clarity at lower power. It’s when you crank up the zoom that I noticed the SX-4 lost its clarity more than the Golden Ring HD. However, the Golden ring HD showed significantly more chromatic aberration. This color bleed annoyed the hell out of me more so than the softer image of the SX-4.
In terms of ranking, the SX-4 sits solidly with the Vortex Viper, if not a notch above it. I would put the Golden Ring HD here as well because it’s rankings are a matter or trade offs. Then the Vortex Razor above all mentioned spotters.
I do not have experience with the SX-5 or any maven or athlon scopes, but the CS-1 looks like it might be similar to the SX-4 and the S1 looks similar to the SX-5, but that is purely speculation.
Honestly, it might be more beneficial for you to hold out and wait to find a used top tier spotting scope at a new mid tier price. My Swarovski ATS 65 is clearer and handles chromatic aberrations at 60X better than my Razor 85 does.
Also, the Nikon Monarch ED spotting scope is still a notch above the Razor without being as expensive as many others. However, Nikons supposed instability in the sports optic market and rather tepid track history of service would make me wary.
Food for thought!