Hello Grapist and welcome to cs drifting
First of all i think that you listed pretty much everything to get the D3 in a good level but i suggest that you take a 19T center rear pulley in order to reduce to CS ratio which is very high on this chassis . Now on the motor/esc section .. I strongly reccomend that you take a brushless SENSORED combo because in cs drifting precise throttle control is a must
I suggest that you take 8.5 to 13.5T Motor . 8.5T would be too powerfull imo . I use a 10.5T Hobbywing Sensored combo and i am really happy with it . When you decide how much Turns your motor would be then you need to decide how much Teeth your pinnion gear should be . For me 10.5T i used a 24Teeth pinnion gear .. The chooise is yours and depeneds on what surface you play . Also i would take a front belt to have in spare cause they tend to wear more than the others .