If you want to truly stick with stock RWD, and want to keep it on the inexpensive side, you will want to pick up RWD models with brushed motors.

If you want to get an EVO and have it be roughly matched with RWD brushed cars, get the 4100kv. 8500 is a lot of motor and you really need a large track to make use of it. You will need an EVO if you want to use your Futaba, and will need to purchase the 82042 MINI-Z EVO Receiver Unit. https://www.manualslib.com/manual/17...r.html?page=41

Keep your eye out for Audi, AMG, McLaren sets. Those have wider wheel offsets, less likely to roll.

Keep looking on the FB groups, there's someone selling a nearly new readyset almost every week.

For tires, most people use PN, Marka, and Kyosho tires. A good starting place is soft or 20˚ 11mm wide tires in the rear, and medium or 30˚ 8.5mm wide tires in front.