I have a G&R lpk in my Noveske lower and it is a good quality kit, I liked that I could order it w/o specific parts I already had, like the trigger. A friend bought a DD kit that was also nice, I think both are fine choices.
I have a coworker that swears by colt lpk’s but I don’t have any personal experience with them.
I’ll throw in another name…RB Precision. I don’t know if anyone else has had experience with their LPKs but mine has been good. Pretty nice trigger too…when I got it, it was only $60
I use the same method. I picked up several ArmaLite spring and detent kits several years ago. Pick and choose my other small parts. I may try one of the G&R Tactical LPK’s, they appear very nice.