I agree quality beats quantity where optics are concerned. I have some 14 x that are superior to 20 X optics and both are allegedly good quality scopes. That said, yes 50 mm I prefer although I do understand there are not huge gains beyond 40 and hardly any past 42-44. I'll take all the advantage I can get as my older eyes aren't as keen as they once were. I would prefer a minimum of 24 power but will go up to 32. Right now my choice is the Leupold 8.5-25x50 VX3 LR. It's around 610.00 OTD and tough to beat for that price. Still throwing around the Sightron S3 6-24 or 8-32 option as well for roughly the same numbers. Decided against the Vortex 6-24 in that price range as it wasn't as clear.And do you have a preference of maximum objective lens size? I'm asking because I'm old school. Nothing larger than 40 mm on my hardware, but from what you've described you'll most likely be in the 50 mm size. And a 30 mm tube has legitimate advantages too. Good glass trumps magnification.
What is your 6-20 and 6-24? I'll admit I've wasted $ on optics in the past, but once I returned to my roots, no more. Are you going to be getting very many shots on Mr Wild E Coyote at that distance?