You can add another to that, the Macap M2 at around I believe $69.00 more than the Preciso. It delivers the goods, and should outlast all the grinders you mentioned by a considerable margin (ie reliability over time). And at a similar price or less I believe than the Isomac Gran Macinino, it will beat the gran macinino hands down, to name just one more. You will be looking at performance / reliability over time / expected life span (type of build) / budget, and somewhere in there there will be a model to suit you.
By the way, do you mean the Sunbean EM480?
Dose Vs doserless is up to the individual. There are plenty of happy operators in both camps and in the end, you will get used to the type you buy.
Re the stepped VS stepless discussion. If you buy a low end grinder, nothing is going to save you. And if you buy a good grinder, it will probably be a good grinder whether it is stepped or stepless and there are pros and cons to both as well as different methods of adjustment within the stepless group.....it depends on the type of use you want to give your new grinder, as to which I would recommend to you.
I would also like to recommend you speak to a professional experienced equipment trader to balance & complete the discussion when you are ready to purchase.
Hope that helps.
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