I bought a new 2009 Adrenalin about 18 months ago, and I love it. It has the 4.6 V8 and yes, it stays in AWD all the time. I can lock it into 4x4 if I want, but I've had little need for that. I was apprehensive about the AWD, but now I love it. I never worry about losing traction on black ice, and I'm not nervously driving with one hand on the 4x4 switch when the roads are slippery. And, I actually get better gas mileage (23 mpg Canadian) than I did with my 2003 ST 4x4. And sorry, it's not for sale.
See my recent post (Rainbow of STAs) if you can't decide which color to get.
Good luck. This is one purchase you won't regret!