I've never actually run Amiga emulation other than just to say that I could. I have, however, owned two 500s, a 2000, a 3000, and now a 1200 (and a third 500, though I don't keep it set up.) I've always found that I much prefer real hardware to the emulation experience, when it can be had at a reasonable cost - and Amiga hardware isn't that rare (nothing like DEC gear.)
I've never once encountered a broken 1084; they seem to last forever. Even if they do eventually break, there's other suitable RGB monitors out there that can be had - Apple IIGS, for instance.