I say get the N/A crossfire. I got my SRT at 22 and the power was a nice upgrade but not extreme since I was coming from a modded SRT-4. My experience going from a Civic to SRT-4 at age 18 was not very smooth and almost got in trouble a few times but luckily didn't(1 ticket no crashes). I had the same thoughts then that I would respect the power and not mess around but that feeling only lasted a month since I thought I became adjusted to the car. At that age you want the car to have fun and show off and not to get to point A to B. The car can become a weapon when you do not know how to control the car. You are coming from a Ford Ranger which is nothing like a SRT-6 in anyway.

Also make sure you take into consideration maintenance costs of this car. Its looks like you are saving 500-1000 a month to buy this car, do you really want to be working 2 jobs just to own a car and miss out on the fun things your friends are doing?