I might be behind the times, I'm sure there's lots of other options, but www.gruntbull.com
does some excellent anno work.
Also I never mentioned it, but my favorite trigger return mechanism (or force if you will) is reverse magnetic polarity (as found in violent triggers and critical triggers). I've owned them on other guns, and in my opinion, they're second to none. Attractive magent returns feel "sticky", springs are a better idea, but the almost feel like there's a limited adjustment before you lose that snappy return and you get a slower reaction...reverse magnetic polarity is trying to repel and the amount of force is determined by how close the magents are, so it gives you a finer range of adjustment, there are no parts touching each other, and it's smooth as butter. Highly recommended, but you have to replace the stock trigger (which is so nice to begin with). I wish this was a stock option from eclipse.
Just thought I would throw in those pennies as well...