There is an awesome section on this forum with TRUSTED dealers here
http://forum.replica-watch.info/vb/forumdisplay.php/trusted-replica-dealers-168
I haven't bought a Pam yet, but I can see that PURETIME has a really LARGE selection with all sorts of prices.
Seems like you are only interested in the case appearance, so just find one that has a cheap movement.
Having said that, I don't know if you want to rush this decision... I also came here looking to rush a Submariner purchase... then when I began to read I saw that it's best to take your time and learn about different versions and movements too... or you might end up wasting your money and time, or, in the worst case scenario, getting scammed.
There's is really a HUGE amount of info here which I think you'll find really interesting.
Best thing to do is:
1- Go to the official Panerai website
2- Compare original pictures with the replicas you see online