I just can't get my head around the 183 - it's difficult enough for me to like Radiomirs, but the added seconds on the 183 just do nothing for me, and if anything, detract from the simplicity of the Radiomir design. Yes, it has a sandwich dial and an exhibition back, but for me, the seconds just ruin it.
The 210 however, is a real beauty - exhibition back, sandwich dial - simple and beautiful - 5 stars!
The 287 is even worse than the 183! Sorry, but that horrible cyclops stuck over the date just ruins the face (and don't get me started on the 'seconds' either...!)
I can see you're leaning towards a Rad, and frankly (and this is MY opinion and I fully understand I'm in a minority of one here) for me it would have to be the 210 - the last time I saw one in my AD I actually hesitated, I admit....
(Of course, if you're really determined to own a Radiomir, I know where there's one going cheap...
)