If it was me, I would dump the Amiga 1200 and keep the Amiga 2000. I have all of the different Amiga models, including the Amiga 1200, and I tell you this, the Amiga 2000 is the best Amiga that Commodore ever produced. It was designed and made in Germany and it is extremely well made. I have 4 Amiga 2000 computers in like new condition, 3 of them still in their original boxes. If I was forced to keep only one Amiga model, I would keep my Amiga 2000 computers and sell the other Amiga models.
FACTS:
I never have problems with any of my Amiga 1000, 500, or 2000 computers.
I always have problems with my Amiga 3000, 3000T, 600, 1200, 4000, 4000T, CDTV, and CD32s.
So, by these facts, I would advise you to keep the Amiga 2000 and dump your Amiga 1200.
I'd take a true 32-bit Amiga any day. And I have several non-working A2000 machines, so they're not quite so hardy as you claim, IMO.