My first concern was that you've been looking at ebay and some replicas, but have landed on a "real" Panerai. Make sure you buy the seller just as much as the watch. As you've seen there are some really good replicas out there. Check the seller's references, call the shops number and confirm they have the watch, with a number you lookup! Call the person at their place of business, again with a number you lookup. Check with people that have bought from them.
What did you settle on - what model (PAM #)?
Welcome again! You will find amazing people and some true experts on the brand here.