Congrats on the new car! Here in WNY, I look at the pony cars, Camaro, Mustang, and my favorite, the Challenger (I don't care if its slower, the rarity factor makes it 10x cooler, and its still faster than I need), but needing the AWD for the winter, plus having 4 real doors made the WRX a hard car to pass up.
I drove all of the listed cars, along with a few others... The WRX had the best balance to me. The Hemi R/T 6-Spd had the coolest retro feel to it though. Not the fastest, not the crispest, but something rarely Americana about it. Like riding my buddies BMW S1000RR then getting on my Buell, or my other buddies Harley Fat Bob, sure they aren't as fast, or crisp, but there's some character to it, and I didn't get that with the Stang. The Camaro just disappointed me all around... I really don't like the cartoonish styling, and the drive was just blah compared to the other cars.
The WRX won out for me due to versatility and practicality... And price, did I mention price?!?