this is the Vaucher automatic that has been specially adapted for RM watches. Hence, what is left is your choice on the style and/or the size of the case. If money is not a concern, and the larger case fits your wrist, then the RM010 would be my choice. The RM005 would run it a close second, and third would be the RM016. That said, there is nothing wrong with the RM016, it is just that to my mind the tonneau case designed from the outset by Richard is now iconic, and that the RM010 movement had been refined over the RM005.
All a matter of taste in the eye of the beholder, so the choice really is yours. Good luck.
Andrew H
PS. A note on the pricing: RM watches tend to hold their value in nominal terms - ie the price from when the watch was bought. RM005's and RM016's bought some time ago and hence the price appears a great deal in comparison with current list; and it is!