My frame was 5017 the first time I had it powder coated.  It was no where near factory.  It looked so bad I contacted the powdercoater and the supplier.  The supplier sent more 5017 to the powdercoater and a bunch of samples to me.  In the end my frame, the new test panel and the sample from the supplier all matched.  I ended up having the frame blasted and powder coated a second time with 5010.

My advice it to get some samples from the powder coat shop and do some comparisons before you commit to a color.  Then go with what you like.  There is a reason they make a gazillion different PC colors... we all have different preferences.

You can get a good idea of the differences by looking at the Picasa album linked in my signature.