If you're considering the mix of performance and obscurity, perhaps the Elantra N. I think most people who like cars know what the Civic SI is, but it's probably the next closest thing to a performance bargain version of an economy car. The Fiesta ST and 500 Abarth were riots when they were being made and wouldn't really stand out in a parking lot either.
For surprise non-FWD performers, the Kia Stinger with the 3.3TT V6 is pretty dang quick and can do mid-400s hp and mid-500s torque with just a piggyback.