[WolfpackS2k]

velvetex, I'm curious how you put together test drive observations. By your own words the only differences you noted between a 2007 Si and 2015 Si are the interior and exterior designs. However the biggest difference between these two cars are the engines! The '07 Si has an 8000 rpm screamer of a K20A engine with VTEC operating on the intake and exhaust valves. Meanwhile the 2015 has a rather pedestrian K24A with a 7100 redline and VTEC on only the intake valves. As far as engine differences go for Hondas, this is pretty big.

Your comment about the BRZ's low center of gravity making you feel every bump in the road makes no sense. A low center of gravity has nothing to do with feeling bumps in the road. In fact a lower center of gravity enables the suspension designers to use softer suspension settings while still achieving high handling targets, which means all things being equal you'd feel fewer bumps. In actuality you feel the bumps because the car has a stiff sporty suspension. Though by all accounts a WRX STI has a stiffer suspension - you should feel more bumps driving that car.

To help you pick a car its helpful to know what you'll be using it for. Do you plan to track your car? Autox events or HPDEs? Or just for daily driving and the occasional spirited weekend drive?