You should just try some other monitors that aren't in the budget category. I'm not really sure why you made a jump from $500 to 10k. The diminishing returns are huge at that price point and in most cases you're mostly paying for the finish on the speaker. There are plenty of nuemann and genelec offerings with sane prices and their engineering is better than what Gethain is putting out.
yeah, speakers do sound different, but you need to figure out if that difference lines up with the price tag and whether it will be of benefit to your work.
I can tell you right now, I've used genelec, neumann, ATC, focal, yamaha, behringer, kali, and JBL monitors and it never really mattered too much which one I was using. My connection to what I heard and worked on had nothing to do with the monitors. I'm feeling a bit old but I'm hitting around year 15 of mixing and still quite active, and the monitors I use are generally the least of my worries. Of course having something neutral with a dispersion that matches your tastes can be nice, but I'd wager going for gethain, ATC, or others is just going to leave you staring at expensive boxes while your mixes don't really improve too much.