I have the Granite, and yes it shows dirt very quickly, almost as much as black does.
I wanted the Silver for this very reason, but it is the misses car, show she went granite.
Silver is the best for dirt by far.
Here are some pics of my Granite, which is mildly dirty.
See the pics are pretty representative of how it looks from a distance
Then compare the first pic to this one after being washed.
Not a massive difference, but as it gets dirtier it looks really crap. Most notably when it rains a little and there is a lot of wet dirt being thrown up.
As you live in LA, I need to explain to you what rain is, so it won't be much of a factor for you.
I'm just want it for the "shorter headlamps".
MY14 GC Limited, 3.0 CRD, Lux II, Granite Crystal, 18" Wheels, Tubular Side Steps.
Could I get my avatar much larger?
Ordered: July 7 2013 Delivered Nov 25th