There is another thread here that talks about a good time for AR fans. In it one of the posters mentioned he refused to buy a lower build kit when he knew he was going to throw the trigger away, or an upper that had parts that would be replaced.
I bought a kit from Palmetto for a very basic AR. It shoots fairly accurately, in 400 rounds so far never any failures of any kind, and goes bang every time I pull the trigger.
I'm getting the urge to build another, this time I plan to go with more of a custom build. Things I know I want this time are a 20" rifle length free float barrel with a Wylde chamber. I'm not really into all the taticool parts... I'm interested in your input as to a better trigger, BCG and other things you feel are a must have on a AR. Also a good source for parts.