WRX-awesome car, have driven many including a 09', very comfy for a 6ft driver, rode and handled great, nice power, just drove it in the snow, un-stoppable!
RX8-horrible gas mileage, no power down low, you have to be above 5k rpm's to get the car to move, my real good friend has been trying to sell his for 2 years, no one wants them around here. It handles good, thats about it. Oh, and his has a exhaust, sounds good. Interior is nice, seats are very comfy.
Challanger-I thought they were only automatic trans. I have driven both the R/T and SRT8, the r/t was a dog, handled poorly, I crushed it with my wifes impala ss. Now the SRT8, its a fun car, auto trans though, little too heavy, feels like it too in the steering, has numb spots. Great power up top, but at 4200+lbs, the torque it has is used up quick. The guy paid $44k for his, not worth it at all. Interior was ugly and plain, horrible materials.
Now for my pick, a new 6spd Camaro, V6 or V8, I have driven both. The V6 has great power, the v6 is more ballanced and handles better than the SS V8. The SS is just awesome, the power never quit, hit 160 and it wanted more, just sick. After I put the corsa exhaust and lmr intake and had it tuned at RDP, the SS was simply the smoothest powered stock internal motored car I have ever driven.
Good luck on the choices.
Steve