Ive used a bunch of different kits and I recently used a full Anderson kit with the stainless FCG for $56. I was surprised how smooth the trigger was and would put it almost equal to the ALG ACT and that is my go to FCG. I know many will hate on Anderson but as far as I can see its a well made kit. All stainless detents and springs.
The CMMG Builders Kit is generally my choice as I choose my pistol grip and FCG. I hate having extra parts laying around. They usually end up morphing into another build. BRD is a bitch.
As far as BCG's I will choose Fail Zero EXO NiB when on sale. ToolCraft would be number two. I recently bought a PSA no name phosphate for $49.99 to use as a spare but almost all my builds get some type of Nickel Boron for ease of clean up. AIM Surplus makes a nice one as well.
If your not in a big hurry, get on some mailing lists for sales and save a few bucks. CDNN was mentioned, Right To Bear, Delta Team Tactical, PSA, and Joe Bobs Outfitters have sales constantly and regular prices are decent.
Good luck with your build!
EDIT: Right To Bear just put these on sale for $39.99 and found out they do it fairly regularly. Another thing, I used a purple spring from an ACT on the FCG and I think if you order a JP spring kit you can make a relly nice trigger pull.