If you are cashed up, the DEX is a great car to return to the hobby with. It is really durable so you wont break that much compared to other cars when you have your L-plates back on.
It would be good to consider if you really want to race, whether you have been to a few events to have a look what the scene is like, and if you want to get into it. If you don't want to race then the DEX may be overkill, although a thing of beauty to own
Having a nice set of tools can make working on the car pleasure. Not essential, but my DEX didn't come with anything. The biggest help I found is a is a ball hex driver for use installing and adjusting the motor.
I am running Futaba brushless servo in my DEX, it works great. As Jimmy has mentioned, if you pick up a low-profile servo you may need to find a solution for the wires fouling the steering post.
You are going to have fun getting back into the hobby. It's worth buying a new car for the love of the build experience.