There was a monitor called the Toshiba TIMM, which was great for amiga. 20" tube, all the way from 15khz up to a 1024x768. Hard to find, but I still have mine. Good for native modes and Dbl modes in AGA. input is VGA style but you just use the adapter.
In the day I had that plus a PC monitor for Picasso IV to do greater than 1024.
Nowadays I guess my opinion would change given the indivision and various other solutions. I'm a big fan of the original screenmodes though, and this monitor strikes a good balance between old school and modern.
