Without a doubt, I'd get the new 1084 monitor.
Amiga graphics look like chunky shit on an LCD monitor. I bought a scandoubler a few years ago to use with an LCD monitor and I was horribly disappointed. Maybe I just got a bad scandoubler, but it felt like my real Amiga had turned into a slow jerky emulated Amiga. I quickly returned the scandoubler and went back to the 1084.
Where the hell did you find a brand new 1084?? I need a few.