I have read alot of past posts using the search but would like an update please. For my MP9 I would like to change the sights. I have settled on the HiViz front, and am stuck between the Warren and 10-8 for a rear. Which rear sight does everyone prefer for use with the HiViz? Is the Warrens notch too wide for precision shot placement at 25 yards? Which color for the HiViz, Red or Green? Thank you for any help in making the decision.