Welcome to repgeek Rene, I woudl recomend you to read about the brands you're interested in, not sure about chopard but Breitling has an awsome sticky guide by By-Tor that is a must read for any fan. All the best breitling replicas are listed there and if it's not there its really not worthy.
As to tourbillon watches they are mostly very poor quality replicas simply because the factories cannot replicate a proper tourbillon so what they do is simply display the balance weel of the watch witch will give the watch away as a replica instantly.

Have a look around, there's plenty of information available on the most sought after brands here, then drop down to the collectors area of the forum and shop around, all the dealers there are trustworthy and pricewise you'll be hard pressed to find the same quality for better money.