1. Esthetically, yes
2. No, but if you have solution 1, then yes.
3. Dual 23+".
A single large non IPS is not a solution if you need more real estate. A decent small (20") or large (32+") monitor still have about the same pixel dimensions, say 1920 x 1080, so they have the same real estate in terms of pixel dimensions.
How do you have the workspace configured? Preview filling one monitor and everything else on the other? Timeline across both monitors?
Timeline across monitors.
I do prefer to have most if not all of my project on my primary 24", while anything else (script, notes, mails - whatever) is displayed on a smaller display. But for preview I do have a dedicated preview display connected to my Decklink card, for proper color and so on.
Depending on the resolution you are working most with, I'd get one display with that resolution (well, anything beyond 2K might be a bit expensive, but I work for TV so HD was it for me).