@maff20
Amiga tech. 1200's have 3.1 as standard but you'll need more ram (or ideally an accelerator) to run os3.9. As for the floppy drive I'm not entirely sure. I know that some of them were indeed dodgy but I don't think it was all. Best to give amigakit a call, I'm sure they'll give you an honest assessment of the drives in the 1200's they sell.
Drives in second hand 1200's can be very dodgy indeed! Believe me I know from experience :lol:
So I'd recommend the "new old stock" option if you can afford it.