Kelley Blue Book says they've figured out the 10 coolest cars for under $18,000. It's a pretty solid list with expected entries like the 2011 Ford Fiesta, 2010 Honda Civic and the 2010 Kia Soul. I'm not entirely sure I'd have the the Scion xB or Suzuki SX4 on my list but they're entitled to their opinion. The 2010 Kia Forte EX should be on the list and it's not.
I'd also add a used Mercury LN7, Chevy Lumina APV and the Chevrolet Celebrity Eurosport but that's just me.