Bigger monitors doesn't look so hot with a native Amiga's output (eg 320x240). I'm currently using a 24" BenQ which is ok but makes everything look a bit blocky. As soon as I can get an IndivisionAGA Mrk2 I will swap to my 21" model which is probably as big as you'd want to go (19" is probably better to be honest).
I just got a lyra KB adapter for my A1200 and I was going to put my A1200 on my desk with my KVM, its just that my current 24" won't sync up to the a1200 and the indivision AGA MK II is made of unubtanium. the 2320 is ok, but picture quality wise its not on par with my old 24.
Also I'm sure my vision is probably somewhat less acute than yours after my 10 laser procedures.
I do think games on my minimig look best on this old 19" 4:3 monitor I have, however I have really gotten to like 724x283 resolution on my 24" for non game stuff. It makes the pixel ratio pretty close to 1:1
I suppose if I put my minimig in 15HZ mode i can test monitors to see if they'll work without having to bring in my A1200 and let those remedials working at the BB or CUSA touch it.