Rarity and Mighty Expensive is my RX8.
You need to think about long run. An 06 out of most the warranty vs a 2010+ no miles with a fresh warranty. The new speed3s are not that bad at all. But you said you have a GT, if thats anything like the RX8 GT then are you giving anything up? Is it going to have all the features you have now? Forget the navigation system. You can get better than factory from companies like kenwood and alpine. But do you keep the heated seats, sun roof, all the little things you will miss?