2013 BRZ vs 2007 STI?

which is the better pick? I live in WA state. Backseat room isn't the biggest deal for me.

• 2013 BRZ premium - $17k, 36k miles
• 2007 STI - $18-20k, 60k miles
• Or shell out extra cash at 23k for 2015 WRX/ 25k for brand new WRX

My intial plan was to get the new WRX, but not sure if it's worth shelling out the extra 6-7k? A used WRX will be close to 24k, I can get a new one for 25k. Hard decisions.