The aernitas tourbillon is probably one of the most accurate FM out there as long as you can find one with the correct spelling of tourbillon. it is expensive though. The others are the crazy hours, I have the long island crazy hours white dial with black numerals. Also the Vegas original is very accurate.
Here's the FM model I bought about 6 months ago: http://www.1-pc8838.com/fmaet10032-aeternitas-tourbillon-ssle-black-flying-tourbill-p-8849.html
I did quite a bit of research on the tourby Aeternitas reps, and this is the one that most closely resembles it's gen. It's a fairly pricey rep tho, at around $750 USD at best. It has the superior Shanghai (classic tourbillon) movement, which btw keeps excellent time (mine only gains about 1 min./ week), and you get a little better than 60 hours on a full wind. My only beef is that the power reserve indicator operates between 6 number markers instead of the full 8.
This is one amazing looking watch...can't understand why Franck Muller it's always lumped into the "other brands" sections.. to me the rolexes and Pams are just plain old hat and boring... but that's just me...
I'm looking for a high end crazy hours dreams... solid 18k if i can find one ... but plate will do if the specs are spot on... Any dealers here specialise in high end Francks?