If you are NEEDING a backseat and you are looking at the G37; I say look at used; you should be able to find something either comparable to 32k or so nicely loaded:
I went by your state and went with a 150mi radius (I live in TX so there are TONS of G37s around here (especially in DFW)) but....I found this for under 29k and it's not bad. if you expand further; you find them with lower mileage and cheaper...go figure:
2008 Infiniti G37 Sport, $27,176 - Cars.com