LPK and UPK

I prefer the White Oak Armament LPK due to it not coming with a trigger. This saves you $30-$40 you can put towards a Geissele.
Daniel Defense and CMT are the other two I would reccommend if you dont plan on swapping the trigger.

The upper parts are pretty much all the same.
 
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JP also has a LPK that does not include a trigger and is considered top quality. Rock River Arms sells a LPK that is excellent IMO and you can get the Rock River kit with a two stage national match trigger that provides a trigger upgrade if you don't want to spend the coin on the Geissele. I run the Rock River kits in most of my AR's and they are good.
 
I purchased an LPK w/out FCG and UPK from Palmetto State Armory for $25 each when they went on sale. Ironically enough, I only needed the springs and detents from the LPK. Everything else was aftermarket. Joe Bob Outfitters will sell you an LPK w/out FCG for 24.95 when you buy certain triggers.