My next purchase for my Stag Model 4 is a Chip McCormick 2-stage trigger. I learned to shoot well with 2-stage triggers and I'm looking forward to one. If I have enough money I might buy a Geissele.
Some people might have an objection to this because it is made in China but I also use a Lucid HD7 Gen III. It's very well made. It has really nice reticles. It works very well. Please don't crash my party about it, I understand what you mean but for $250 it's a really excellent red dot sight. If they're going to make one this nice, I might as well buy one - that was my feeling, anyway, and I haven't been disappointed.
The Stag Model 4 has a 20" heavy barrel and it's not light for an AR, but I like that, and I wanted it that way. It's extremely stable offhand. It's extremely stable in prone. It's a little less wieldy, it's longer and heavier, but I like it. You have a lot of room to hold it, and the barrel is wonderful.
http://mylucidgear.com/reddotsights.php
I'll probably build a second AR this year unless Obama issues an Executive Order banning them, which is a distinct possibility.