I'm the one that ran 14s. I'm surprised that apparently no one else has done this (mainly because only a handful of GXPs have been run at the track). I think I could get a 14.50 out of it in good air if I could just get a chance to get it back to the track. If anyone makes it to the track, please run premium fuel, preferably for at least a few weeks beforehand. I can't say for certain if that will make a difference, but it can't hurt. With the quality control on the newer vehicles, I am skeptical about factory freaks. I think anyone should be able to run a 14 in one of these cars with some practice runs and decent air.
Funny that Venom mentioned a GTO, as there was a red GTO on the lot when I was looking at the Bonneville (both used, this was in 2006). I didn't need 4 doors, and the price was just a little more for the GTO. But it just looked like a large Chevy Cavalier, and the Bonne was absolutely georgeous. I looked at Charger R/Ts too - they drove great but they just looked like rental cars to me, and were more expensive at that time.
Anyway, I made the right decision. My only major complaint is the (in my opinion) lackluster performance. Seems to be worse in the warmer weather. I always thought the headlights sucked, but I did a HID projector retrofit and solved that problem. Mine'* got 71k and has been humming along for quite a while with no issues. I've thought about getting something else, but there is really nothing out there that I can lust after enough to part with the Bonne and shell out the bucks for.