Brushless requires a specific ESC. NitroRCX cars have proprietary parts on them that are only available on their store.
Stay away from most HPI stuff too, they tend to go proprietary on a minority of parts.
I recommend a Tamiya. RTR is what you want but Tamiya is best in kits. Kits require electronics and sometimes bodies.
Now, you see. I'm new to R/C stuff and I have no idea what those acronyms are. Help me out here man.
Are you suggesting to stay away from NitroRCX entirely? iirc, on their website, there seemed to be a lot of different brands. Are they actually asking the manufacturer of each brand to make parts a specific way? Or is it that they own the brands shown on their websites and make it that way themselves?
Haha I'm sorry it's just habit.
ESC means Electronic Speed Control. It is the "brain", if you will. Brushless motors run on magnets instead of brushes, so the need a specific "brain" to tell them how to run. Good brushless setups cost a bunch.
HPI is just a brand, Hobby Products international.
RTR Means Ready to run, you have a battery, controller, and car. Just need to charge and then run.
A kit is a car that you build from scratch, similar to a model kit. You will need to buy the "brain" (speed control, commonly referred to as "speedo" or "ESC"), a controller and reciever (sometimes included with controller), a motor, servo, and most commonly a body.
NitroRCX carries OEM products IIRC.
A figurative and completely hypothetical example
Let's say you want to purchase a drift car on a budget, and have narrowed it down to 2 cars. One car is made in China, from some obscure brand. You don't know what it is, and how it performs so you don't want to purchase it. You see NitroRCX carries a MadSpeed Drift and it's only a couple bucks more, but comes from somewhere reputable. You get it and are happy with your purchase. Eventually, you become curious, and purchase the chinese one for shits and giggles. You find out that it's the EXACT same thing as the NitroRCX car you purchased awhile ago.
What I believe they do is purchase OEM products and then market it as their own brand. I could be wrong but the parts are still proprietary.
TL;DR version: It's the 2nd choice. Rule of thumb, if you haven't heard of it too much it's probably worth it to stay away until it gets more traffic.
If you really want to get started on some common RC Terminology, here's a couple.
ESC: Electronic Speed Control- Controls the motor speed and direction
Servo: It operates your steering linkage, allowing your wheels to turn
Steering Linkage: It's what makes your wheels turn with the help of your servo.
Transmitter: Sometimes referred to as the remote, it sends the signal to the reciever to control the car
Reciever: The servo and ESC are plugged into here. Signals are recieved from the transmitter and sent to the electronics.
Brushless: Sometimes referred to as BL, it is a magnetic propelled motor that requires a specific ESC, and can propel the car at higher speeds than with a brushed motor
Brushed: Standard motor, the brushes will wear out after awhile and is usually thrown out if included with a car. Can use with any ESC except for Brushless ESC. Lower RPM.