Andrew,
I installed a set of Meprolight adjustables on mine. They are excellent. Cost is $150 retail, if you get the discount at Brownells or Midway, you can get them for $101.
Since you said you plan to use it for HD, take some friendly advice: either remove the trigger stop screw or screw it all the way in and check it often. Ironically, trigger stops are about the least tactical thing one could do to a handgun. When I first got mine I was playing with it at the range, and the way I had it adjusted, there were a couple of times when the trigger couldn't even be pulled back far enough to drop the hammer. This was with some very slight adjustments. Stops are fine at the range, but a great liability on a "working" gun.
Get used to that trigger, too. It has the lightest trigger of all the pistols I own, and, since I don't shoot it as often as my Glocks and Sigs, I find that 1 or 2 rounds out of every mag, the trigger breaks before I expect it to. Again, no problem at the range, but NOT GOOD for defense. It's pretty damn scary when a gun goes off before you expect it to, even when your finger's on the trigger and it's pointed downrange.
pojim