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I think Red Barn Armory is the way to go for the LPK, but they're constantly out of stock of stuff.
Thought I'd let you know I went with your advice on the grip and RBA for the LPK. I really like that I could build the kit exactly the way I wanted to, although to your point they were out of a few parts. Just placed the order and will get to assembling next week.
Red Barn Armory - Build Your Own AR15 LPK (Lower Parts Kit)
[Grip:BCM GUNFIGHTER Mod 3 BLK]
[Safety Selector:Rock River Arms Star Selector]
[Trigger:ALG Defense Quality Mil-Spec (QMS)]
[Trigger Guard:BCM Gunfighter Mod 0 BLK]
[Takedown/Pivot Pin Option:RBA Mil-Spec Pin Set (No Charge)]
I'm also still reworking my spreadsheet. Up to 4 options now, including two with the Aero M4E1 upper and handguard. I lose the sweet deal on the standard Aero upper + BCG, but when I look at similar quality handguards the expense is a wash. And the ease of installation with the enhanced upper is a big selling point for me (no timing required!).
Oh, and the budget has been creeping up between $150-200 more.