Acura RSX Type S or Infiniti G35 Coupe?

I am looking to trade in my 2001 Land Rover Discovery Series II for a more fuel efficient coupe. I've narrowed the search down between a 2002 Acura RSX Type S with 85,000 miles and a 2004 Infiniti G35 Coupe with 53,000 miles. The Acura and the Infiniti get 31 and 27 mpg on the highway, respectfully, where I'll be doing most of my driving. Both cars are in mint condition: no scratches or dents, clean interiors, and clean titles. I test drove both and loved them. They are asking $18,500 for the Infiniti and $12,000 for the Acura. What's the better deal and why?