I'm having the same problem. Ordered SG, then noted the purplish hue, then debated a lot over changing to TiAg. Now my car is almost in... I ordered a pretty common combination (premium, auto, cold weather), and the dealer actually has or could easily get me an alternative in silver. Not sure what to do. My brother/girlfriend/friend/and even a random person at the dealer both like the SG better, but the purple seems to be gnawing at me (even saw it in a parking garage once, and the fluorescent lights made it seem truly violet)
