I've used a Samsung SyncMaster 15GLi for over six years, at resolutions from 640x480/256/512 right on up to 1600x1200.
Compared to a Hyundai 15" (running similar screen-sizes), the Samsung's res-switching is suberb!
I even have several CUSTOM sizes edited through Picasso96.
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My advice for those considering 19" and upwards CRTs is to keep an eye on the shops -- It seems that these sizes are to be dropped from product ranges in the near future in favour of LCD models.
I can afford a 19" CRT myself, but 17"-18" LCDs are out of my reach!