I have had both and have a wrist of just over 7 inches. I much prefer the look of the full size, the hands look stubby on the mid size as a consequence of the bezel taking up so much of the real estate and leaving a smaller dial area. The mid felt OK but I always hankered after the 41mm and when I got one I found it to be one of the most comfortable watches I have ever worn. They are incredibly slim at ~11mm which helps a lot. Only you can really judge but I think you should go for the 41mm. Regarding case measurement, I would think the crown is around 4-5mm so at a guess circa 45mm inc crown.
One thing to consider, the mid size models retain a lot less value in the after market so you may be able to pick up a second hand one pretty cheaply, certainly comfortably under a grand. There are plenty on offer from Japanese sellers for instance due to the average wrist size over there being rather smaller. The full size models generally fetch £200-300 more model for model on ebay and the like.
