ORIGINAL: RoswellGrey
I'd definitely go with Titanium. I was kinda disappointed in the one blue Challenger I've seen.
The only Deep Water Blue I've seen in person was on a Caliber, and I was right up next to it. It looked great, but I'd need to see one from far away.
That Titanium looks awesome, though. What colour striping would you put on the side? Black (would make for a light contrast accent) or silver (more contrast) ?