Before I mention anything....................5040 is an impeccable watch. It is one of my favorites. I do accept the fact that it is small.
But I think that smallness causes major appeal, forget today's standards. You are thinking that way because of your recent Panerai history.
Large watches became popular today but it will change tomorrow.
Try to look at it once again from a different point of view as well. 5040 is a life long watch.
I have a small wrist, I have seen someone wearing one with a large wrist and it just looks amazing.
Please reconsider.
Trust me on this I have had 44mm panerais, 47mm 1950, AP Montoya.
I don't like to wear big watches anymore. Also, I am almost married to PP only.
I am not a big fan of 5135 because of its shape only. I can highly suggest 5146R, which is very new collection of 2008. The prices should be close between the two.
If the cost is not an issue, my list is pretty large; among the ones you mentioned:
I am more in favor of a 5960 rather than 5070.
If I were you; Locate a 5040 you like, also order a 5960 from the same dealer. It will take some time for the 5960 to arrive anyway.
That is a great way to start
Then slowly, we will pull you into our Nautilus section where you will post another "debate" you will have, about which one to pick.
Don't worry we will help you then as well.
Good luck! whichever you pick, they are all winners.