So let me just go through a few of the choices I made when doing this build.

Frame - The Ledroneclub Pickle3 is a very light frame, lighter than all its contenders including KababFPV's TP3 and Dave_C_FPV's Sanchez. The Sanchez Air might be lighter but it is a bit too flimsy for these large and hefty motors.
Motors - RCX 1304 5000kv motors are known for their efficiency and power on 3S, I was able to get them at an insane price of $28 for 4 motors with free shipping. The wide stator (good control) and good QC made it pretty much a no-brainer decision.
Stack - GEPRC, iFlight and Diatone all make a pretty good 16x16 stack. The reason I chose GEPRC is because I got the stack on a sale at $40 and of the three companies, GEPRC seems to have the best reliability. Also love the 3 pin plug for the camera, cuz screw soldering :D

AUW: ~125g with a GNB 450mah 3S, a little heavier with GNB 550mah 3S, both fly amazing. Power for days and punch to the moon! Hang time is pretty good and flight time is even better. 550mah 3S gives a little over 4.5 minutes of pretty intense ripping.