LPKs tend to be mass produced hardware: avoid very cheap but pretty much everything else is GTG. PSA stuff is as good as any in that regard. If you plan on using your rifle outdoors in very cold weather, make sure the trigger guard is big enough to allow you to wear gloves.
One word of advice: your Aero Precision lower is threaded for a 4-40 setscrew to secure the rear takedown pin detent. If you ever wind up removing the end plate, the spring is secured in place by the set screw. The only issue is that it doesn't include a 4-40 screw and the Allen key for that size is not on a standard set of Allen keys. I had to buy a Wiha micro set to get the (IIRC 0.015") right size. Other than that, love everything about the Aeros.
Use a white grease to cover everything that isnt readily accessible: detents, springs, etc.