Esc
Depends on your experience level. Hobbywing v3.1 120 amp are good has built in switch and has a cool feature allowing you to turn esc off by just holding the brake for 8 seconds, easy to use if you stick to the multifunction program box and it's preloaded options. They can be a pain when you get into firmware updates and understanding all the version options. The speed passion reventon pro 1.1 is great and easy to use and tune with program box. Trakpower ms-1 is good but needs PC to tune. Hacker TensorIc 160 amp esc. Can tune with program box, another great esc. Have never used orca but hear they are good. My top 3 would be the hacker TensorIc, reventon pro 1.1, and hobbywing v3.1.
Hacker also makes a killer motor, the hacker skalar. Just my 2 cents.