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dfk41 in my humble opinion I don’t t think you need to pay more than 1K for a grinder, you will enter into the diminished returns territory. When I used to make espresso a few years ago I used the Compak K10 and also the E10, both were beast. I got the best espressos in my life. I also had the Mazzer Kony which uses the Niche 63mm conical and the results were fantastic. Don’t think I you will notice a difference from 68mm to 71mm and honestly just to avoid a bit of retention I wouldn’t pay around 2500€.