If it was a Commodore model, you'd make a mint off it, they only made 200 or so units, one went on ebay for something crazy like $10K a few years back iirc.
I don't recall the amiga technologies ones being very different, apart from the branding so it would be worth faking one for that kind of money.
The only new hardware for the a1200 is the 030 cards, which aren't that exciting. I'd probably go for the a4000 if it had an 040 or 060. The only thing that would sway me is if the a1200 had a PPC+graphics cards and the a4000 didn't.
