I'm in Virginia...not exceptionally hot, but 90-95 in the summer and humid! The following numbers are all related to the hottest of days:
My 2001 502, with the "smaller" factory 502 radiator runs 190-195 when running smooth at 50-60 MPH even with my manual fan switch at the off position. When I push it around 65 MPH and up I typically need to turn the fan on to keep the temps around around the 195-200 mark.
In bumper to bumper, on a hot day, I am usually at a minimum of 195 and as high as 210 if I'm stopped for long.
For what it's worth, I bought a set of the Baker Air Wings a couple of years ago and have gotten it down where I can install/remove them in about 3 minutes. They make quite a difference on a long ride/hot day. Not much in the looks department, but I bought the clear ones so they're not that noticeable. Their universal ones will bolt up easily to the side radiator shroud support tabs if you drill a hole for the single bolt. I cut the brackets down on mine by about 2" so they don't stick out as much. I also apply some electrical tape to keep them from slipping. Works great and directs the air right at my crotch/mid-section.
Form vs. Function...on the strictly function days these things are hard to beat for the breeze they create!
Keep us posted, Geez, on any progress you make in reducing temps! I know that Neil Webber is also working on this topic as well and has been for quite some time.