That's tough because quickness is basically inversely proportionate to reliability.
Here's my suggestion: an early '00's Lexus is300. I know it's older than your 8 years, but they're reliable have OK power stock. And if that's not enough, by dropping a few grand on turboing them or putting in turbo engine they become horsepower monsters that are still fairly reliable.
Is that along the lines of what you might be looking for?