If you want value. I just used the new Amain private label motor. (Eco something, bright green) Got it for $40 on Black Friday. It was just as good as my Team Powers Actium I was using. Who knows how long it will hold up but I was impressed.
TRF 418 - Team Powers 17.5, HobbyWing Stock Spec, Xpert servo
Xray T4 2016 - Trinity D4, HobbyWing Stock Spec, Ko Propo servo and radio
KustomRCGraphics.com (Best looking novice on the track)