If trigger weight is an issue, check out the JARD website. (click on the "Order" box for trigger spring info).
www.jardinc.com They now have trigger spring kits for up to a 5 lb. pull. I've had two JARD triggers, one of the first ones out and one of the latest design. The first one required some fitting and was a bit too light, (trigger had to shortened to clear the trigger guard and I cut a new trigger spring for a heavier pull).
The newer model required no fitting at all. I got the 3 lb. trigger spring and it is SWEET.
Installation is pretty simple, but it helps to have a slave pin handy for installing the hammer. I made one from an old drill bit.
The biggest problem that you can run in to is the sear engagement set screw. It uses the same hole as the pistol grip screw and if it's not threaded all the way through, you'll have to thread it yourself. If you don't have a 1/4 inch 28 thread cutter, a trip to the hardware store will be required.
If you do get a JARD, be sure to use Loctite (comes w/trigger). I use it in a setup with a 14.5 heavy barrel w/KKF A3 brake and ACOG TA11. It is very fast....unfortuneately, I'm not.