You guys always overlook the obvious (and normally pretty cheap) solution. :-)
Just get a composite/rgb to VGA converter used with Playstations, Dreamcasts, etc., (the universally compatible ones) and you can use ANY VGA/SVGA monitor with any Amiga under any resolution your system supports. They really look great on a SVGA monitor (I use my Dreamcast on a 19 inch flat screen Viewsonic G90f for example, and I also have plugged in a CD32 the same way).
The silver RGB to VGA adapters (I have a few of these btw if anyone has been looking for one) work super as well, but ONLY under the ~30kHz resolutions (ie: no games). Or if you have a multisync monitor like a 1950, 1960, etc you can use any resolution you want (I have a couple of these as well if anyone is looking for one).