well, I am newbie myself. But I get to know that Davidsen is a specialist in panerai replicas. gonna get mine in the coming weeks which is a rxw mm20 replica. I will post some picture in due time. My tip is go for a quality watches but bear in mind you have to invest 400 usd at least. some cheaper offers seems attractive at first glance but considering the low quality they offer its quite expensive.
spec you might need to take into consideration irrepective of models:
-100% real sapphire not synthetic once which are mineral glasses with a shapphire coating (risk to explode)
-100% swiss unitas movement not swiss/asia combination (however, I am not criticising the asia movement but swiss tend to be more reliable depending on the quality of the source)
-superlumed (perfect illumination)
-cannon pin fixed
go to links section above and click on dealers you should be able to find davidsenjpn and other dealers.
hope this helps
sorry for my improper english