I do not own a 1911 and would like to. I'm considering an R1, but in doing so I would like to add some things like a better hammer, beaver tail grip-safety and better sights. Nothing grand, but I would like it for carry IWB. In budgeting for this, I'm trying to get a ballpark figure of what a simple upgrade like that would add to the pistol. Also, am I missing anything? Any help is appreciated.