I have used the following and have found them to be of good/decent quality with the caveat that the triggers are all your run of the mill standard AR trigger:
Armalite
Stag/CMT
RRA
I liked the Armalite's the best followed closely by Stag/CMT. (finish and appearance)
I had no complaints with the RRA, but I generally avoid RRA and CMMG for reasons not related to their LPKs.
Ultimately, pretty much any standard name brand LPK is going to be more or less the same as any other.