High end. Over £1000. Way too much power for an OS that is, after all, just a browser. Speedy with a great keyboard and display, you have a couple of years of life out of it before Google stops supporting it.
Mid-range. Around £400-£600. Decent build quality and a reasonable lick of speed, you’ve not over-spent this time. However, the keyboard and display is a bit crap for the money you’ve spent. Google will definitely have stopped supporting it within a year.
Budget. Costs about £200-300. Poor keyboard, slow as hell and don’t even get me started on the laughable display. Google will stop supporting it, quite possible, within months, if not by the time you’ve bought it.