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Any non Espresso brew method from Drip Filter, Syphon or Vacuum, Plunger, Ibrik, Stovetop, Mocha Pot, Aeropress, Cold Press, Percolator, Presso or any other mad scientist process that doesn't have a pump and boiler combined.
Entry level (sub $500) domestic appliances that you would expect to find in the kitchen section of whitegoods stores. You can get a pretty good coffee from machines in this category if you use fresh coffee and dose/tamp well.
Pointy End ($1500-$3000) will find machines that are capable of making espresso at the same time that you are texturing milk. This end of the market also tends to get some real design flair and lot and lots of shiny stainless. Mostly the machines in this category are direct descendants of Cafe class machines.
Extreme Machines ($3000+) is the very serious end of the home espresso machine market. Some of the machines you will find in here would be comfortable in just about any cafe on the planet and most will have similar installation requirements (plumbing, maintenance etc). Most CoffeeSnobs drool over the very pretty toys in this category.
Burr size is something for spec-sheets, it has little to do with the performance and more to do with cost, noise, weight, time, power/torque which then affects motor and foot-print size. Larger burr...