Before you get too far into your "wish list" for modifications to that pistol, go over to Wayne Novak's website and read his recommendations about the things that are really needed for a good carry pistol. Especially look at the "reliability" suggestions, also the sights and trigger pull suggestions.
http://novaksights.com/custom_guns.htm#4_RECOMMENDATIONS
http://novaksights.com/custom_guns.htm#4_RECOMMENDATIONS