Get one of your 32" monitors now and use it with your iMac screen as a 2-monitor setup.
Then next year, add the other 32" monitor and the Mac Mini (or Studio) to get to your destination.
Repurpose the existing iMac, trade it in, sell it or give it away next year.
As to monitor suggestions, both
ASUS &
LG have 32" 6K monitors expected to hit soon though I don't believe either has announced pricing just yet. My guess is north of ASD but well south of Apple's 6K monitor.
If north of ASD pricing is too much, you might want to punch "32" monitors for under $XXXX" (filling in your target for $XXXX) into a search box and then start clicking links and exploring the options. Get your brain around key features like resolution, ports, picture quality, etc. so you can choose up to 2 monitors that you might still be using 10-15 years from now. In other words,
choose wisely... you'll probably have this monitor longer than you'll own maybe your next 2-3 Macs, 4-6 iPhones, etc purchased over the next 10-15 years. Budget accordingly.
OR, you might want to do what I did and go ultra-wide options... which can be like 2 monitors inside of one frame. I jumped from iMac 27" to
Dell 40" 5K2K, which is priced about the same as ASD but comes with all that added width + a substantial hub instead of just a few ports of only one type + "stand options" included + 120Hz "promotion" and more than one input so you can use it with other tech too without having to swap cables. I'm quite pleased with it. If you might be too, perhaps consider 2 of those over time for your dual monitor setup, stacked up one above the other or side by side for an
ultra-ultra-wide setup. Note that while 40" is substantially more than 32", this one isn't much taller than iMac 27", so it may not be tall enough for your purposes (unless you do stack one atop the other in a 2 monitor setup).
