I may have missed it in one of the posts, but are you going with piston or original gas operated piston?
Take a look at the FailZero uppers and bolts if you are not going piston. It's a hard-faced upper and needs no lubrication. However, the lower bolt will still need lube to keep from hanging up on the mag.
A Wilson trigger (pricey @ $220) is a drop in excellent trigger with and excellent reset. You might really like their TRIM rail.
I like the Phase 5 ambidextrous charging handles, sling attachments and bungee one point slings.. You can get the charging handles in 3 sizes.
Stark pistol grip is pretty good.
For your muzzle device check out
http://www.youtube.com/watch?v=ZtVB4IubWyc a couple of friends made. There are 5 youtube videos on muzzle break comparison you'll have to find them after the first link and wade in. They make comparison on muzzle climb, sound, flash suppression, semi/full-auto, debris kicked up when shooting prone, etc. Helps you pick what you need for your purpose.
Some good instructions and drills that help you learn how to work an AR.
Grip and stance...the basics on fighting with an AR. It takes some time to forget the old forearm hold learned over decades, but the new hand-over grip really helps in control and speed. Note this when you select a gas block and rail....YOU DO WANT to have a low profile gas block and a longer rail. The low profile block will keep you from burning your hands and the longer rail is needed to facilitate the grip. You'll want to have that front site as a folddown way out front out of the way of your grip....which also increases your sight radius which is overall a good thing.
Basic grip, stance, etc.:
http://www.youtube.com/watch?v=FbhmDOY4BeE&feature=relatedhttp://www.youtube.com/watch?v=BcwZNXkIw7U&feature=relmfuhttp://www.youtube.com/watch?v=41wuFOTByp8&feature=relatedhttp://www.youtube.com/watch?v=oikDoKBqup0&feature=relmfu