Everyday I fight the urge to order a CRT from this page, I am afraid it won't work properly. One day I might just say "who cares" and buy one anyway, unless anyone wants to give it a shot and report back. 
http://www.xgaming.com/store/category/arcade-parts-and-accessories/
Recently I was lucky enough to find 2 NOS Sony PVM-20M2U monitors for a reasonable shake. Had to make an Amiga -> BNC cable, but they are truly phenomenal. (15 kHz, 50/60 Hz no problem.) 20" is a bit large for sitting up close with low-res Amiga games, fortunately they have an underscan function which comes in handy.
The only problem with buying old, or even NOS CRTs - they are fragile as heck, and even in the factory boxes will often get jostled around enough during shipping to knock them way out of calibration. But if you go through the long process of dialing them in, there is nothing better (IMHO) for classic gaming. The smaller ones like the 1084 usually fare a lot better though than the 80lb beasts.
Personally I've re-imagined the past where monitors were always flat and light.
"I reject your reality and substitute my own!"
Doctor Who, the Deadly Assassin 1974
I wish I could find a monitor with perfect convergence, geometry, etc, but without the smearing, lag, and resolution scaling problems of flatscreens. I also can't handle any type of "scanrate conversion" that entirely molests the signal and produces b0rked scrolling. (Or the periodic mouse pointer hop and tearing artifacts in WB when the Amiga and scandoubler re-synch.) That said, I wouldn't even consider using a CRT with a modern computer. With the Amiga, I have yet to find a monitor that does everything perfect. The closest is probably a little 17" late-90's iiyama I have connected to a Picasso IV. It's simply fabulous.
