The crossfire may be getting old but it doesnt "look" old. Besides your Crossfire is practically a Mercedes so now you'll have 2. Since you've been maintaining the Crossfire for all these years, you've gained the experience of maintaining a Mercedes vehicle. Besides as you've said you'll be "less out pocket selling the Mazda5". I think your problem is solved in my opinion. You cant show up at our Crossfire meets in a Mazda dude!