Wow, there's a lot of ways you could go here. Assuming you're serious about going the 4-5 seat coup route and dropping $30k you could get a Scion FR-S or Subaru BR-Z, or the Scion TC as a budget option. For raw power in a compact (thus good MPG) there are the Ford Focus/Fiesta ST's or a Mazdaspeed 3 or a Civic Si, although only the civic comes as a coupe. The Civic or TC will really be your most reliable options. Then there's luxury nameplates, but most of that is some combination of sedan or 2-seat or unreliable. Theres the Acura RSX from a few years back; way below your budget and older than your parameters, but they're nice reliable sporty cars. You could get a used Infinity G37, but they're kind of big/lower mpg. I'm ignoring all the european stuff here for reliablility concerns.