I have run a 120A trackstar sct in a converted 8ight 2.0 EU and had no problems. The Some really like the 150A trackstar gen2 so that could be a good one.
For motor I suggest the 1900kv red can or the SMC motor; the trackstar is a bit cheaper but I prefer the solder posts of the SMC.
A pair of these batteries will fit within your budget, they are quite decent and if you have a good charger you can just drive, swap batteries between car and charger and continue.
The Losi conversion kit will accomodate bigger lipos if you want higher single-pack runtime but those are more expensive.