It seems like the possinbilities are endless. The A -series engine and rotaries seem like a popular choice because of their low weight, while high torque motors, which are often more fun on the street, seem to be almost twice as heavy. I am familiar with the obvious pros and cons of the stock engine, rotaries and newer turbo and non turbo fours, but what about those not so often spoken about qualities engines exhibit such as sound, how the engine feels when it pulls, etc.

I'd like to have the ideal engine for a street/performance car, that does occasional autocross and road events. Possibly as a daily driver. But if there is an engine combo that is just too cool than I'd be willing to sacrifice lots of practicality for it.