I normally do not recommend buying a watch you are not sure if you like because you should really only buy whatever watch you have your eyes on. But since you've posted many questions about which watch to get and not having worn a Luminor or Radiomir before, I'd make an exception in your case and actually recommend you buying the PAM183 Black Seal as your 1st PAM.
The PAM183 is one of the base models and one of the most affordable PAM's out there. So I would suggest wearing this 183 for a while and see if you actually like the Radiomir case. If you find the 45mm size too big, then u shouldn't get any of the 47mm Rads. If you don't like the wear and look of the Radiomir, then you can always sell it and try a Luminor next. The 183 is very liquid so you won't have any difficult time selling and u won't lose much money at all when you sell it IMO.
Buy the 183 right now and try it out. It'll give you a better idea of what you will or will not like about Panerai watches.
My 2 cents,
Anthony