Also, if it's a carry gun don't forget night sights. I have Trijican night sights on my H&K (P7 M10) and Glock 20 (10 mm), and a Meprolight front sight to go with my Benelli ghost ring rear sight on my M1 Super 90.
Mr. Merryman, the 1911s shoot really well in 45 ACP... it is a very consistent round. I know I should go to it myself as I shoot much better with that round than I do with either the 10 mm or the . 40 S&W that I normally shoot, I just can''t bring myself to it... yet.
The secret is practice, practice, practice.